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English definition of “keen”

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keen

adjective uk   /kiːn/ us  

keen adjective (EAGER)

B1 very interested, eager, or wanting (to do) something very much: They were very keen to start work as soon as possible. Joan wanted to go to a movie but I wasn't keen (= I didn't want to go). She's a keen tennis player She's keen on (playing) tennis. UK My son's mad keen on cycling. He's rather keen on a girl in his school (= he is very attracted to her).
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keen adjective (STRONG)

extreme or very strong: Many people are taking a keen interest (= a very great interest) in the result of the vote.C1 very good or well developed: a keen sense of smell

keen adjective (SHARP)

literary very sharp: a keen north wind
keenly
adverb uk   /ˈkiːn.li/ us  
They are keenly (= extremely) aware that this will be their last chance to succeed.

keen

verb [I] uk   /kiːn/ literary us  
to make a loud, long, sad sound, especially because someone has died
keenness
noun [U] uk   /ˈkiːn.nəs/ us  
the quality of being keen
(Definition of keen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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