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keen 1 (kēn)
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adj. keen·er, keen·est
1. Having a fine, sharp cutting edge or point.
2. Having or marked by intellectual quickness and acuity. See Synonyms at sharp.
3. Acutely sensitive: a keen ear.
4. Sharp; vivid; strong: "His entire body hungered for keen sensation, something exciting" (Richard Wright).
5. Intense or bracing: a keen wind.
6. Pungent; acrid: A keen smell of skunk was left behind.
7.
a. Ardent; enthusiastic: a keen chess player.
b. Eagerly desirous: keen on going to Europe in the spring.
8. Slang Great; splendid; fine: What a keen day!

[Middle English kene, from Old English cēne, brave.]

keenly adv.
keenness n.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2017 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 
keen 2 (kēn)
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n.
A loud wailing or lament for the dead.
intr.v. keened, keen·ing, keens
To wail in lamentation, especially for the dead. See Synonyms at cry.

[From Irish Gaelic caoineadh, from caonim, I lament, from Old Irish caínim, coínim, perhaps of Brittonic origin.]

keener n.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2017 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

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