C1 English Vocabulary List (CEFR)

This is the C1 vocabulary list from Wordineer’s CEFR ESL dataset (50 words at this level). Each word has part of speech, American English IPA, a plain-language definition, and an example sentence — see the source and methodology.

aesthetic

C1

adjective · /ɛsˈθɛtɪk/

Relating to beauty or the look of art

“The building has strong aesthetic appeal.”

facilitate

C1

verb · /fəˈsɪləˌteɪt/

To make an action or process easier

“The app facilitates group study sessions.”

compelling

C1

adjective · /kəmˈpɛlɪŋ/

Very interesting and hard to stop reading

“She wrote a compelling story about war.”

inherent

C1

adjective · /ɪnˈhɪrənt/

Being a basic part of something's nature

“There is an inherent risk in extreme sports.”

catalyst

C1

noun · /ˈkætələst/

Something that causes or speeds up a change or event

“The financial crisis was a catalyst for major policy reform.”

skeptical

C1

adjective · /ˈskɛptəkəl/

Having doubts about something

“I am skeptical of his claims.”

tangible

C1

adjective · /ˈtændʒəbəl/

Real and able to be touched or seen

“The team saw tangible results from training.”

plausible

C1

adjective · /ˈplɔzəbəl/

Seeming reasonable or likely true

“His excuse for being late was plausible.”

empirical

C1

adjective · /ˌɛmˈpɪrɪkəl/

Based on what you observe, not on theory

“The study offers empirical evidence for the drug.”

paradigm

C1

noun · /ˈpɛrəˌdaɪm/

A model or pattern that represents how something works

“The internet created a new paradigm for communication.”

redundant

C1

adjective · /rɪˈdʌndənt/

Not needed because there is too much

“That last sentence is redundant.”

articulate

C1

adjective · /ɑrˈtɪkjəˌleɪt/

Able to express ideas clearly and effectively

“She is a very articulate speaker who explains ideas clearly.”

mitigate

C1

verb · /ˈmɪtəˌɡeɪt/

To make something less severe, serious, or painful

“We must find ways to mitigate the effects of climate change.”

reconcile

C1

verb · /ˈrɛkənˌsaɪl/

To bring people or ideas back together

“The couple decided to reconcile after months apart.”

resilient

C1

adjective · /rɪˈzɪljənt/

Able to recover quickly from hard times

“Children can be very resilient after loss.”

concurrent

C1

adjective · /kənˈkɜrənt/

Happening at the same time

“The two concurrent meetings ended at noon.”

myriad

C1

noun · /ˈmɪriəd/

A very large number of things

“The forest has a myriad of insect species.”

pragmatic

C1

adjective · /præɡˈmætɪk/

Dealing with problems in a practical way rather than following fixed ideas

“We need to take a more pragmatic approach to this problem.”

anomaly

C1

noun · /əˈnɑməli/

Something that is different from what is normal

“The warm January was a weather anomaly.”

intrinsic

C1

adjective · /ɪnˈtrɪnsɪk/

Belonging naturally to something

“Art has intrinsic value beyond its price.”

stringent

C1

adjective · /ˈstrɪndʒənt/

Strict and hard to meet

“The lab has stringent safety rules.”

ubiquitous

C1

adjective · /juˈbɪkwɪtəs/

Seeming to appear or exist everywhere at the same time

“Smartphones have become ubiquitous in modern life.”

pertinent

C1

adjective · /ˈpɜrtɪnɪnt/

Directly related to the topic

“She asked pertinent questions during the talk.”

conjecture

C1

noun · /kənˈdʒɛktʃər/

A guess made without full proof

“His theory is based on pure conjecture.”

cohesive

C1

adjective · /koʊˈhisɪv/

Joined together as one strong whole

“The staff formed a cohesive team.”

disparate

C1

adjective · /ˈdɪspərɪt/

Very different in kind

“The book brings together disparate ideas.”

conducive

C1

adjective · /kənˈdusɪv/

Helping to make something happen

“Quiet rooms are conducive to study.”

reciprocal

C1

adjective · /rɪˈsɪprəkəl/

Given and received in equal amounts

“They have a reciprocal trade deal.”

eloquent

C1

adjective · /ˈɛləkwənt/

Expressing ideas fluently and in a way that is persuasive or moving

“Her eloquent speech moved the entire audience.”

arduous

C1

adjective · /ˈɑrdʒuəs/

Requiring a lot of hard, tiring effort

“The arduous hike took two full days.”

impede

C1

verb · /ɪmˈpid/

To slow down or block progress

“Heavy snow impeded the rescue effort.”

reiterate

C1

verb · /riˈɪtərˌeɪt/

To say something again for emphasis

“Let me reiterate that safety comes first.”

nuance

C1

noun · /ˈnuɑns/

A subtle difference in meaning, expression, or sound

“He appreciated the nuances of French cuisine.”

apprehensive

C1

adjective · /ˌæprɪˈhɛnsɪv/

Worried about something that may happen

“She felt apprehensive about her first flight.”

quintessential

C1

adjective · /ˌkwɪntɪˈsɛnʃəl/

Being the perfect example of something

“That song is the quintessential summer hit.”

tenuous

C1

adjective · /ˈtɛnjəwəs/

Weak and easily broken

“The link between the two events is tenuous.”

ambivalent

C1

adjective · /æmˈbɪvələnt/

Having mixed or contradictory feelings about something

“She felt ambivalent about leaving her hometown for the new job.”

synthesize

C1

verb · /ˈsɪnθəˌsaɪz/

To combine ideas or facts into a whole

“She synthesized data from ten reports.”

dogmatic

C1

adjective · /dɑɡˈmætɪk/

Sure your beliefs are right without doubt

“He is dogmatic about his diet rules.”

corroborate

C1

verb · /kərˈɑbərˌeɪt/

To provide proof that supports a claim

“Two witnesses corroborate her story.”

exacerbate

C1

verb · /ɪɡˈzæsərˌbeɪt/

To make a bad situation worse

“Loud noise exacerbates his headaches.”

substantiate

C1

verb · /səbˈstæntʃiˌeɪt/

To provide proof for a claim

“He could not substantiate his story.”

scrutinize

C1

verb · /ˈskrutəˌnaɪz/

To examine something very carefully and critically

“The committee scrutinized every detail of the proposal.”

exemplify

C1

verb · /ɪɡˈzɛmpləˌfaɪ/

To be a typical example of something

“Her work exemplifies modern art.”

proliferate

C1

verb · /proʊˈlɪfərˌeɪt/

To increase quickly in number

“Coffee shops proliferate near the university.”

extrapolate

C1

verb · /ɪkˈstræpəˌleɪt/

To use known facts to guess about unknown ones

“We extrapolate future sales from past data.”

delineate

C1

verb · /dɪˈlɪniˌeɪt/

To describe something in careful detail

“The map delineates the town's borders.”

vindicate

C1

verb · /ˈvɪndəkeɪt/

To show that someone was right after doubt

“The new evidence vindicated the judge.”

acquiesce

C1

verb · /ˌækwiˈɛs/

To agree quietly without protest

“He acquiesced to the new office rules.”

juxtapose

C1

verb · /ˌdʒʌkstəˈpoʊz/

To place two things close together for contrast

“The film juxtaposes wealth and poverty.”

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CSV (imports into Anki, Quizlet)

All C1 words (50)

A

WordPart of speech
acquiesceverb
aestheticadjective
ambivalentadjective
anomalynoun
apprehensiveadjective
arduousadjective
articulateadjective

C

WordPart of speech
catalystnoun
cohesiveadjective
compellingadjective
concurrentadjective
conduciveadjective
conjecturenoun
corroborateverb

D

WordPart of speech
delineateverb
disparateadjective
dogmaticadjective

E

WordPart of speech
eloquentadjective
empiricaladjective
exacerbateverb
exemplifyverb
extrapolateverb

F

WordPart of speech
facilitateverb

I

WordPart of speech
impedeverb
inherentadjective
intrinsicadjective

J

WordPart of speech
juxtaposeverb

M

WordPart of speech
mitigateverb
myriadnoun

N

WordPart of speech
nuancenoun

P

WordPart of speech
paradigmnoun
pertinentadjective
plausibleadjective
pragmaticadjective
proliferateverb

Q

WordPart of speech
quintessentialadjective

R

WordPart of speech
reciprocaladjective
reconcileverb
redundantadjective
reiterateverb
resilientadjective

S

WordPart of speech
scrutinizeverb
skepticaladjective
stringentadjective
substantiateverb
synthesizeverb

T

WordPart of speech
tangibleadjective
tenuousadjective

U

WordPart of speech
ubiquitousadjective

V

WordPart of speech
vindicateverb

Frequently asked

How many words are on the C1 list?

50 at this level. 50 have a written definition and example sentence.

Can I import the CSV into Anki or Quizlet?

Yes. Both accept comma-separated files with a header row. Columns are word, pos, level, ipa, definition, example.

Where do the pronunciations come from?

American English IPA, transcribed from the CMU Pronouncing Dictionary. Stress marks: ˈ primary, ˌ secondary.

Built and maintained by Garrick Dee. Last verified: 2026-09-30 · Dataset v2.0.0 · Sources: Oxford 3000 (A1-B1), Oxford 5000 (B2-C1), English Vocabulary Profile (C2), CMU Pronouncing Dictionary (via NLTK), wordfreq (Zipf, en).

Cite: Wordineer CEFR ESL Vocabulary (v2.0.0), Garrick Dee, 2026. License: CC BY 4.0.