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Keen \Keen\ (k[=e]n), a. [Compar. {Keener} (k[=e]n"[~e]r);
superl. {Keenest}.] [OE. kene sharp, bold, AS. c[=e]ne bold;
akin to D. koen, OHG. kuoni, G. k["u]hn, OSw. kyn, k["o]n,
Icel. k[ae]nn, for k[oe]nn wise; perh. akin to E. ken, can to
be able. [root]45.]
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.
--Chaucer.

That my keen knife see not the wound it makes.
--Shak.

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. --Shak.

Before the keen inquiry of her thought. --Cowper.

3. Bitter; piercing; acrimonious; cutting; stinging; severe;
as, keen satire or sarcasm.

Good father cardinal, cry thou amen
To my keen curses. --Shak.

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.
--Goldsmith.

5. Eager; vehement; fierce; as, a keen appetite. ``Of full
kene will.'' --Piers Plowman.

So keen and greedy to confound a man. --Shak.

6. Wonderful; delightful; marvelous; as, that would be keen.
[slang]
[PJC]

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.

Syn: Prompt; eager; ardent; sharp; acute; cutting;
penetrating; biting; severe; sarcastic; satirical;
piercing; shrewd.