keen

/kiːn/adjective

Very eager or enthusiastic; also, quick and sharp in noticing things.

Example sentences

“He's always been keen to learn new languages.”
“She has a keen eye for spotting mistakes in contracts.”

British English uses 'keen on' for liking things ('keen on golf') far more than American English, where the word can sound formal.

Featured as word of the day on May 16, 2026.

Synonyms for keen

Antonyms

reluctant
unenthusiastic
unwilling

Find it in: Positive words, Words to describe a person.

Related words

acuteVery strong, keen, or sharp in effect or perception.incisiveQuick, sharp, and direct in judgment or expression.jovialFull of good humor and warmth toward others.jauntyShowing a cheerful, confident, and energetic attitude.intrepidBrave and adventurous; showing no fear.litheSlender and flexible, moving with ease and grace.