1.Sharp; having a fine edge or point; as, a keen razor, or a razor with a keen edge. "A bow he bare and arwes (arrows) bright and kene." "That my keen knife see not the wound it makes."
2.Acute of mind; sharp; penetrating; having or expressing mental acuteness; as, a man of keen understanding; a keen look; keen features. "To make our wits more keen." "Before the keen inquiry of her thought."
3.Bitter; piercing; acrimonious; cutting; stinging; severe; as, keen satire or sarcasm. "Good father cardinal, cry thou amen To my keen curses."
4.Piercing; penetrating; cutting; sharp; applied to cold, wind, etc.; as, a keen wind; the cold is very keen. "Breasts the keen air, and carols as he goes."
5.Eager; vehement; fierce; as, a keen appetite. "Of full kene will." "So keen and greedy to confound a man."
6.Wonderful; delightful; marvelous; as, that would be keen. (slang) Note: Keen is often used in the composition of words, most of which are of obvious signification; as, keen-edged, keen-eyed, keen-sighted, keen-witted, etc.
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