Meaning of “keen” - Learner’s Dictionary

keen

adjective us uk /kiːn/
I liked his last book but I'm not so keen on this latest one.Both Jack and his wife are keen chess players.I invited him to come but he didn't seem very keen.Her mother's a keen gardener.He has a keen interest in photography and cars.
INTERESTED

B1 very interested or enthusiastic:

He's very keen on travelling.
WANTING TO DO

B1 wanting to do something very much:

VERY GOOD

very good or well developed:

a keen sense of smell
keenness noun [ U ]
keenly adverb

(Definition of “keen” from the Cambridge Learner’s Dictionary © Cambridge University Press)