keen - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “keen”

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keen

adjective [-er/-est only]  us   /kin/

keen adjective [-er/-est only] (STRONGLY FELT)

(esp. of emotions and beliefs) strongly felt: a keen interest in painting

keen adjective [-er/-est only] (DEVELOPED)

(of an awareness or ability) very developed, or (of the mind) very quick to understand: a keen eye for detail a keen sense of smell

keen adjective [-er/-est only] (EAGER)

eager, interested, and enthusiastic: Theresa isn’t too keen on pets.
(Definition of keen from the Cambridge Academic Content Dictionary © Cambridge University Press)
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