TTile Streak

C1 is the level where English stops feeling like a set of rules and starts feeling like a tool you can shape. This page works through a set of words at that level, each one with a plain meaning and a sentence that shows it doing real work.

What C1 means

C1 is a level on the CEFR scale, the Common European Framework of Reference for Languages, the system most English courses and exams use to describe how advanced a learner is. It sits one step below the top level, C2, and generally means a learner can follow fast, idiomatic speech and write flexibly on complex topics.

How the list and board work

Each word on this page shows pronunciation, part of speech, a plain meaning and an example sentence. Below the list, the play this list board serves a guessing round using only words from this page, with the same green, yellow and gray tiles as Tile Streak's other boards.

This is a working list built from documented sources, not a certified or official C1 list. No single exam body owns the term, so we are describing these words as C1-level rather than claiming an endorsement, and we are not stating a fixed word count while the list is still growing.

A few examples

Nuanced (adjective): having small but meaningful shades of difference. "Her nuanced take on the policy avoided the usual yes-or-no argument."

Discerning (adjective): showing good judgment, especially about quality. "A discerning editor cut the weakest chapter without being asked."

Pragmatic (adjective): dealing with problems in a practical way rather than by fixed rules. "The team took a pragmatic approach and shipped a smaller fix first."

Ambivalent (adjective): having mixed or conflicting feelings about something. "He was ambivalent about the move, excited and nervous in the same breath."

Study tips for C1-level words

Learn words that let you soften or sharpen a claim. Nuanced and pragmatic do real work in an argument. Practice using them to qualify an opinion, not just define them.

Read them inside longer, real sentences, not flashcard lists. C1 vocabulary earns its keep in how it connects to the rest of a sentence.

Say each word out loud in a full sentence of your own. Fluent use under pressure is the actual C1 skill, not silent recognition.

Revisit a missed word after a few days. Immediate recall after reading is not the same test as recall a week later.

Notice the words in real reading, not just on this page. A C1 word you spot in an article you chose yourself sticks harder than one you only met on a study list.

For teachers and self-study learners

If you're studying alone, the play this list board turns these words into a short daily round, and the vocabulary quiz sends anything you miss into a review deck. If you teach advanced learners, each entry, word, meaning, example, is ready to use in a handout without extra editing.

Keep going

Compare this list with IELTS-level words, test yourself with the vocabulary quiz, browse vocabulary books for deeper reading, or try ESL vocabulary games for more practice.

The list

WordSay itPart of speechWhat it means
ABACK/əˈbæk/advHaving the wind against the forward side of the sails.
ABATEMENT/əˈbeɪtmənt/nounThe act of abating.
ABBREVIATE/əˈbriviˌeɪt/verbShorten.
ABDOMINAL/æbˈdɑmənəl/adjOf or relating to or near the abdomen.
ABERRANT/æˈbɛrənt/adjMarkedly different from an accepted norm.
ABHORRENT/æbˈhɔrənt/adjOffensive to the mind.
ABJECT/ˈæbdʒɛkt/adjMost unfortunate or miserable.
ABLAZE/əˈbleɪz/adjKeenly excited (especially sexually) or indicating excitement.
ABNEGATION/ˌæbnɛˈɡeɪʃən/nounThe denial and rejection of a doctrine or belief.
ABOMINABLE/əˈbɑmənəbəl/adjUnequivocally detestable.
ABOMINATION/əˌbɑməˈneɪʃən/nounAn action that is vicious or vile; an action that arouses disgust or abhorrence.
ABORTIVE/əˈbɔrtɪv/adjFailing to accomplish an intended result.
ABREAST/əˈbrɛst/adjBeing up to particular standard or level especially in being up to date in knowledge.
ABSOLVE/əbˈzɑlv/verbLet off the hook.
ABSORB/əbˈzɔrb/verbBecome imbued.
ABSORBENT/əbˈzɔrbənt/adjHaving power or capacity or tendency to absorb or soak up something (liquids or energy etc.).
ABSORPTION/əbˈzɔrpʃən/nounThe process in which incident radiated energy is retained without reflection or transmission on passing through a medium.
ABSTAIN/əbˈsteɪn/verbChoose not to consume.
ABUZZ/əˈbʌz/adjNoisy like the sound of a bee.
ABYSMAL/əˈbɪzməl/adjVery great; limitless.
ACCEDE/ækˈsid/verbTake on duties or office.
ACCELERATION/ˌækˌsɛlɚˈeɪʃən/nounAn increase in rate of change.
ACCUSATIVE/əˈkjuzətɪv/adjContaining or expressing accusation.
ACCUSATORY/əˈkjuzəˌtɔri/adjContaining or expressing accusation.
ACERBIC/əˈsɛrbɪk/adjHarsh or corrosive in tone.
ACHIEVER/əˈtʃivɚ/nounA person with a record of successes.
ACHY/ˈeɪki/adjCausing a dull and steady pain.
ACKNOWLEDGMENT/ækˈnɑlɪdʒmənt/nounA statement acknowledging something or someone.
ACME/ˈækmi/nounThe highest level or degree attainable; the highest stage of development.
ACQUAINT/əˈkweɪnt/verbCause to come to know personally.
ACQUIESCENCE/ˌækwiˈɛsəns/nounAgreement with a statement or proposal to do something.
ACREAGE/ˈeɪkɚɪdʒ/nounAn area of ground used for some particular purpose (such as building or farming).
ACRID/ˈækrɪd/adjStrong and sharp.
ACRIMONIOUS/ˌækrəˈmoʊniəs/adjMarked by strong resentment or cynicism.
ACROBATIC/ˌækrəˈbætɪk/adjVigorously active.
ACTIONABLE/ˈækʃənəbəl/adjAffording grounds for legal action.
ACTIVATE/ˈæktəˌveɪt/verbMake active or more active.
ACTUALITY/ˌæktʃuˈæləˌti/nounThe state of actually existing objectively.
ACUTE/əˈkjut/adjHaving or experiencing a rapid onset and short but severe course.
ADAGIO/əˈdɑʒiˌoʊ/nounA composition played in adagio tempo (slowly and gracefully).
ADAPTATION/ˌædəpˈteɪʃən/nounA written work (as a novel) that has been recast in a new form.
ADDRESSABLE/əˈdrɛsəbəl/adjCapable of being addressed.
ADHESION/ædˈhiʒən/nounThe property of sticking together (as of glue and wood) or the joining of surfaces of different composition.
ADIPOSE/ˈædəˌpoʊs/adjComposed of animal fat.
ADMIRABLY/ˈædmɚəbli/advIn an admirable manner.
ADMISSIBLE/ədˈmɪsəbəl/adjDeserving to be admitted.
ADMONITION/ˌædməˈnɪʃən/nounCautionary advice about something imminent (especially imminent danger or other unpleasantness).
ADOLESCENT/ˌædəˈlɛsənt/adjRelating to or peculiar to or suggestive of an adolescent.
ADORING/əˈdɔrɪŋ/adjExtravagantly or foolishly loving and indulgent.
ADRIFT/əˈdrɪft/adjAfloat on the surface of a body of water.
ADROIT/əˈdrɔɪt/adjQuick or skillful or adept in action or thought.
ADULTEROUS/əˈdʌltɚəs/adjNot faithful to a spouse or lover.
ADVERSE/ædˈvɝs/adjContrary to your interests or welfare.
AEROBIC/ɛˈroʊbɪk/adjBased on or using the principles of aerobics; enhancing respiratory and circulatory efficiency.
AESTHETIC/ɛsˈθɛtɪk/adjConcerning or characterized by an appreciation of beauty or good taste.
AESTHETICALLY/ɛsˈθɛtɪkli/advIn a tasteful way.
AESTHETICS/ɛsˈθɛtɪks/nounThe branch of philosophy dealing with beauty and taste (emphasizing the evaluative criteria that are applied to art).
AFFABLE/ˈæfəbəl/adjDiffusing warmth and friendliness.
AFFERENT/ˈæfɚənt/adjOf nerves and nerve impulses; conveying sensory information from the sense organs to the CNS.
AFFIX/ˈæfɪks/verbStick or fasten to.
AFFLICT/əˈflɪkt/verbCause physical pain or suffering in.
AFIELD/əˈfild/advFar away from home or one's usual surroundings.
AFIRE/əˈfaɪr/adjLighted up by or as by fire or flame.
AFLAME/əˈfleɪm/adjKeenly excited (especially sexually) or indicating excitement.
AFOOT/əˈfʊt/adjTraveling by foot.
AFOUL/əˈfaʊl/adjEspecially of a ship's lines etc.
AFRESH/əˈfrɛʃ/advAgain but in a new or different way.
AFTERGLOW/ˈæftɚˌɡloʊ/nounThe pleasure of remembering some pleasant event.
AFTERTHOUGHT/ˈæftɚˌθɑt/nounAn addition that was not included in the original plan.
AFTERWARD/ˈæftɚwɚd/advHappening at a time subsequent to a reference time.
AGAPE/əˈɡeɪp/adjWith the mouth wide open as in wonder or awe.
AGELESS/ˈeɪdʒləs/adjContinuing forever or indefinitely.
AGGRAVATION/ˌæɡrəˈveɪʃən/nounAction that makes a problem or a disease (or its symptoms) worse.
AGGREGATE/ˈæɡrəɡət/adjFormed of separate units gathered into a mass or whole.
AGLOW/əˈɡloʊ/adjSoftly bright or radiant.
AGONIST/ˈæɡənɪst/nounA muscle that contracts while another relaxes.
AGROUND/əˈɡraʊnd/adjStuck in a place where a ship can no longer float.
AIRDROP/ˈɛrdrɑp/nounDelivery of supplies or equipment or personnel by dropping them by parachute from an aircraft.
AIRFLOW/ˈɛrfloʊ/nounThe flow of air.
AIRHEAD/ˈɛrˌhɛd/nounA flighty scatterbrained simpleton.
AIRLESS/ˈɛrləs/adjLacking fresh air.
AIRPLANE/ˈɛrˌpleɪn/nounAn aircraft that has a fixed wing and is powered by propellers or jets.
AIRTIGHT/ˈɛrˌtaɪt/adjHaving no weak points.
AIRWORTHINESS/ˈɛrˌwɝðinəs/nounFitness to fly.
AJAR/əˈdʒɑr/adjSlightly open.
ALABASTER/ˈæləˌbæstɚ/adjOf or resembling alabaster.
ALACRITY/əˈlækrəti/nounLiveliness and eagerness.
ALBATROSS/ˈælbəˌtrɑs/nounSomething that hinders or handicaps.
ALGEBRAIC/ˌældʒəˈbreɪɪk/adjOf or relating to algebra.
ALIBI/ˈæləˌbaɪ/nounA defense of some offensive behavior or some failure to keep a promise etc.
ALIENATION/ˌeɪliəˈneɪʃən/nounThe voluntary and absolute transfer of title and possession of real property from one person to another.
ALIGHT/əˈlaɪt/adjLighted up by or as by fire or flame.
ALIYAH/əˈliə/nounThe honor of being called up to the reading desk in the synagogue to read from the Torah.
ALLEGORICAL/ˌæləˈɡɔrəkəl/adjUsed in or characteristic of or containing allegory.
ALLEGRO/əˈlɛˌɡroʊ/advIn a quick and lively tempo.
ALLURING/əˈlʊrɪŋ/adjHighly attractive and able to arouse hope or desire.
ALOFT/əˈlɔft/advAt or on or to the masthead or upper rigging of a ship.
ALOOF/əˈluf/adjRemote in manner.
ALPHABETIC/ˌælfəˈbɛtɪk/adjArranged in order according to the alphabet.
ALTERNATION/ˈɔltɚˌneɪʃən/nounSuccessive change from one thing or state to another and back again.
ALTITUDE/ˈæltəˌtud/nounElevation especially above sea level or above the earth's surface.
ALVEOLAR/ælˈviəlɚ/adjPertaining to the sockets of the teeth or that part of the upper jaw.
AMALGAM/əˈmælɡəm/nounA combination or blend of diverse things.
AMATEURISH/ˈæməˌtʃɝɪʃ/adjLacking professional skill or expertise.
AMBIDEXTROUS/ˌæmbəˈdɛkstrəs/adjEqually skillful with each hand.
AMBIVALENT/æmˈbɪvələnt/adjUncertain or unable to decide about what course to follow.
AMBULATORY/ˈæmbjələˌtɔri/nounA covered walkway (as in a cloister).
AMIABLE/ˈeɪmiəbəl/adjDisposed to please.
AMICABLE/ˈæmɪkəbəl/adjCharacterized by friendship and good will.
AMICABLY/ˈæmɪkəbli/advIn an amicable manner.
AMISS/əˈmɪs/advAway from the correct or expected course.
AMNIOTIC/ˈæmniɔtɪk/adjOf or related to the amnion or characterized by developing an amnion.
AMOROUS/ˈæmɚəs/adjInclined toward or displaying love.
AMORPHOUS/əˈmɔrfəs/adjHaving no definite form or distinct shape.
AMPHIBIOUS/æmˈfɪbiəs/adjOperating or living on land and in water.
AMPLIFICATION/ˌæmpləfəˈkeɪʃən/nounAddition of extra material or illustration or clarifying detail.
AMPUTATE/ˈæmpjəˌteɪt/verbRemove surgically.
ANACHRONISTIC/əˌnækrəˈnɪstɪk/adjChronologically misplaced.
ANAEROBIC/ˌænɚˈoʊbɪk/adjNot aerobic.
ANARCHIC/æˈnɑrkɪk/adjWithout law or control.
ANATHEMA/əˈnæθəmə/nounA detested person.
ANCILLARY/ˈænsəˌlɛri/adjFurnishing added support.
ANDANTE/ɑnˈdɑnteɪ/advAt a moderately slow tempo.
ANECDOTAL/ˌænəkˈdoʊtəl/adjCharacterized by or given to telling anecdotes.
ANEMIC/əˈnimɪk/adjLacking vigor or energy.
ANESTHETIC/ˌænəsˈθɛtɪk/adjCharacterized by insensibility.
ANGELIC/ˌænˈdʒɛlɪk/adjMarked by utter benignity; resembling or befitting an angel or saint.
ANIMATE/ˈænəmət/adjBelonging to the class of nouns that denote living beings.
ANOMALOUS/əˈnɑmələs/adjDeviating from the general or common order or type.
ANSWERABLE/ˈænsɚəbəl/adjMorally or legally responsible to a higher authority.
ANTAGONISM/ænˈtæɡəˌnɪzəm/nounThe relation between opposing principles or forces or factors.
ANTAGONISTIC/ænˌtæɡəˈnɪstɪk/adjCharacterized by antagonism or antipathy.
ANTAGONIZE/ænˈtæɡəˌnaɪz/verbProvoke the hostility of.
ANTECEDENT/ˌænˈtɛsədənt/nounAnything that precedes something similar in time.
ANTHROPOLOGICAL/ˌænθrəpəˈlɑdʒəkəl/adjOf or concerned with the science of anthropology.
ANTIC/ˈæntɪk/adjLudicrously odd.
ANTICANCER/ˌænˌtaɪˈkænsɚ/adjUsed in the treatment of cancer.
ANTICLIMACTIC/ˌæntiklaɪˈmæktɪk/adjComing after the climax especially of a dramatic or narrative plot.
ANTIPATHY/ænˈtɪpəθi/nounThe object of a feeling of intense aversion; something to be avoided.
ANTIPODES/ˌæntɪˌpoʊdiz/nounAny two places or regions on diametrically opposite sides of the Earth.
ANTISEPTIC/ˌæntəˈsɛptɪk/adjThoroughly clean and free of or destructive to disease-causing organisms.
ANTISOCIAL/ˌæntɪˈsoʊʃəl/adjShunning contact with others.
ANTITHESIS/ænˈtɪθəsəs/nounExact opposite.
ANTITHETICAL/ˌæntəˈθɛtɪkəl/adjSharply contrasted in character or purpose.
APATHETIC/ˌæpəˈθɛtɪk/adjShowing little or no emotion or animation.
APOLOGETIC/əˌpɑləˈdʒɛtɪk/adjOffering or expressing apology.
APOLOGIST/əˈpɑlədʒəst/nounA person who argues to defend or justify some policy or institution.
APOPLECTIC/ˌæpəˈplɛktɪk/adjPertaining to or characteristic of apoplexy.
APPARITION/ˌæpɚˈɪʃən/nounA ghostly appearing figure.
APPEND/əˈpɛnd/verbFix to; attach.
APPORTIONMENT/əˈpɔrʃənmənt/nounThe act of distributing by allotting or apportioning; distribution according to a plan.
APPRECIABLE/əˈpriʃəbəl/adjEnough to be estimated or measured.
APPRECIABLY/əˈpriʃəbli/advTo a noticeable degree.
APPREHENSION/ˌæprɪˈhɛnʃən/nounFearful expectation or anticipation.
APPREHENSIVE/ˌæprɪˈhɛnsɪv/adjQuick to understand.
APPROACHABLE/əˈproʊtʃəbəl/adjCapable of being read with comprehension.
APPROXIMATE/əˈprɑksəmət/verbBe close or similar.
APPROXIMATION/əˌprɑksəˈmeɪʃən/nounAn imprecise or incomplete account.
APROPOS/ˌæprəˈpoʊ/advAt an opportune time.
AQUEOUS/ˈeɪkwiəs/adjSimilar to or containing or dissolved in water.
ARBITER/ˈɑrbɪtɚ/nounSomeone with the power to settle matters at will.
ARBITRARY/ˈɑrbəˌtrɛri/adjBased on or subject to individual discretion or preference or sometimes impulse or caprice.
ARBITRATOR/ˈɑrbɪˌtreɪtɚ/nounSomeone chosen to judge and decide a disputed issue.
ARBOREAL/ɑrˈbɔriəl/adjInhabiting or frequenting trees.
ARCANE/ˌɑrˈkeɪn/adjRequiring secret or mysterious knowledge.
ARCHETYPAL/ˈɑrkˈtaɪpəl/adjRepresenting or constituting an original type after which other similar things are patterned.
ARDOR/ˈɑrdɚ/nounA feeling of strong eagerness (usually in favor of a person or cause).
ARDUOUS/ˈɑrdʒuəs/adjCharacterized by effort to the point of exhaustion; especially physical effort.
ARGUMENTATIVE/ˌɑrɡjəˈmɛntətɪv/adjGiven to or characterized by argument.
AROUSAL/ɚˈaʊzəl/nounThe act of arousing.
AROUSE/ɚˈaʊz/verbCall forth (emotions, feelings, and responses).
ARREARS/ɚˈɪrz/nounThe state of being behind in payments.
ARTFUL/ˈɑrtfəl/adjMarked by skill in achieving a desired end especially with cunning or craft.
ARTHRITIC/ɑrˈθrɪtɪk/nounA person afflicted with arthritis.
ARTICULAR/ɑrˈtɪkjəˌlɝ/adjRelating to or affecting the joints of the body.
ARTICULATE/ɑrˈtɪkjəˌleɪt/adjExpressing yourself easily or characterized by clear expressive language.
ARTICULATION/ˌɑrtɪkjəˈleɪʃən/nounExpressing in coherent verbal form.
ARTISTICALLY/ɑrˈtɪstɪkli/advIn an artistic manner.
ASCENDANT/əˈsɛndənt/nounPosition or state of being dominant or in control.
ASCETIC/əˈsɛtɪk/adjPracticing great self-denial.
ASKEW/əsˈkju/advTurned or twisted to one side.
ASPIRANT/ˈæspɚənt/nounAn ambitious and aspiring young person.
ASSENT/əˈsɛnt/nounAgreement with a statement or proposal to do something.
ASSERT/əˈsɝt/verbInsist on having one's opinions and rights recognized.
ASSERTIVE/əˈsɝtɪv/adjAggressively self-assured.
ASSIMILATE/əˈsɪməˌleɪt/verbBecome similar to one's environment.
ASTHMATIC/æzˈmætɪk/nounA person suffering from asthma.
ASTONISHMENT/əˈstɑnɪʃmənt/nounThe feeling that accompanies something extremely surprising.
ASTRAL/ˈæstrəl/adjBeing or relating to or resembling or emanating from stars.
ASTRAY/əsˈtreɪ/advAway from the right path or direction.
ASTRIDE/əsˈtraɪd/advWith one leg on each side.
ASTRINGENT/əsˈtrɪndʒənt/adjTending to draw together or constrict soft organic tissue.
ASTROLOGICAL/ˌæstrəˈlɑdʒɪkəl/adjRelating to or concerned with astrology.
ASTUTE/əˈstut/adjMarked by practical hardheaded intelligence.
ASUNDER/əˈsʌndɚ/adjWidely separated especially in space.
ASYMMETRICAL/ˌeɪsəˈmɛtrɪkəl/adjIrregular in shape or outline.
ASYMPTOTIC/ˈæsɪmpˌtɔtɪk/adjRelating to or of the nature of an asymptote.
ATHLETICISM/æθˈlɛtɪˌsɪzəm/nounIntense energy.
ATOMIC/əˈtɑmɪk/adjOf or relating to or comprising atoms.
ATROCIOUS/əˈtroʊʃəs/adjShockingly brutal or cruel.

Showing 200 of 300 words. Every meaning comes from Open English WordNet.

Questions

What does C1 mean?

C1 is a level on the CEFR scale, the Common European Framework of Reference for Languages, used to describe how advanced a learner's English is. It sits one step below the top level, C2.

Is this an official C1 word list?

No single exam body publishes one fixed official C1 list. We choose these words ourselves from documented sources and describe them as C1-level, not certified by any exam.

How many words are on this page?

We are not publishing a fixed count while the list is still being built. More words get added as we document them.

How is C1 different from IELTS-level words?

They overlap. CEFR levels and exam bands both describe advanced English, and a word that fits one usually fits the other. This page focuses on the CEFR framing rather than one specific test.

Can I practice these words in a game?

Yes. The play this list board serves a guessing round using only words from this page, and the vocabulary quiz turns any missed word into a review deck.

Do you show pronunciation and example sentences?

Yes, next to part of speech and a plain meaning, for every word on the page.