Definitions
1.adjectiveOften with a prepositional phrase, or with to and an infinitive: showing a quick and ardent responsiveness or willingness; eager, enthusiastic, interested."I’m keen on computers."
2.adjectiveFierce, intense, vehement."This boy has a keen appetite."
3.adjectiveHaving a fine edge or point; sharp.
4.adjectiveAcute of mind, having or expressing mental acuteness; penetrating, sharp.
5.adjectiveAcrimonious, bitter, piercing."keen satire or sarcasm"
6.adjectiveOf cold, wind, etc.: cutting, penetrating, piercing, sharp."a keen wind"
7.adjectiveOf prices, extremely low as to be competitive.
8.adjectiveMarvelous."I just got this peachy keen new dress."
9.adjectiveBrave, courageous; audacious, bold.