English Reference

Word

thin

US/ˈθɪn/

UK/θˈɪn/

Definitions

01not thick

A2 · Elementary

adj. having a small distance between two sides; not thick.

adj. having little thickness or extent from one surface to its opposite.

“The ice on the lake is too thin to walk on safely.”

“The artisan used a thin blade to carve the intricate patterns into the delicate wooden box.”

Synonyms

Antonyms

02body weight

A2 · Elementary

adj. having little fat on the body.

adj. having little body fat or flesh; lean or slender in build.

“He became very thin after being sick for two weeks.”

“The marathon runner had a thin, wiry frame that was perfectly suited for long-distance endurance.”

Pitfall

She is very thin, she looks beautiful.

She is very slim, she looks beautiful.

'Thin' can sometimes sound negative or unhealthy; 'slim' is usually a compliment.

Synonyms

Antonyms

03liquid or air

B1 · Intermediate

adj. flowing easily like water; not thick or sticky.

adj. of low viscosity or density; lacking substance or volume.

“The air is very thin at the top of the mountain.”

“The sauce was too thin, so the chef decided to simmer it for another ten minutes to reduce the liquid.”

Synonyms

Antonyms

04not crowded

B2 · Upper Intermediate

adj. having only a few people or things in a large space.

adj. distributed at wide intervals; not dense or crowded.

“The crowd at the stadium was thin because of the heavy rain.”

“Vegetation becomes thin as you move further into the desert, with only a few hardy shrubs surviving the heat.”

Synonyms

Antonyms

05to make less dense

B2 · Upper Intermediate

v. to make something thinner or to reduce the number of things in a group.

v. to make or become thin or thinner in consistency or density; often used with 'out'.

“You should thin the carrots so the remaining ones have room to grow.”

“The traffic began to thin out after the morning rush hour ended and the commuters reached their offices.”

Usage

Often used as the phrasal verb 'thin out' when referring to crowds or plants.

Synonyms

Antonyms

06in a thin way

B2 · Upper Intermediate

adv. in a way that is not thick.

adv. in a scattered or sparse manner; not thickly.

“Spread the butter thin on the toast so it is not too greasy.”

“The paint was applied so thin that the grain of the wood was still visible underneath.”

Synonyms

Antonyms

Collocations

Common phrases and expressions where native English speakers use the word “thin” in context.

01. thin film

Word family

ADJECTIVE

thin(A2)

Idioms

Domain

Aviation

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.A2 KeyIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.3.0–4.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 2.0–2.524–43TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.225–549
Frequency
Common
Level
A2 · ElementaryOxford
Updated

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