American Dictionary of the English Language

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KEEN, adjective

1. Eager; vehement; as hungry curs too keen at the sport.

The sheep were so keen on the acorns--

2. Eager; sharp; as a keen appetite.

3. Sharp; having a very fine edge; as a keen razor, or a razor with a keen edge. We say a keen edge, but a sharp point.

4. Piercing; penetrating; severe; applied to cold or to wind; as a keen wind; the cold is very keen

5. Bitter; piercing; acrimonious; as keen satire or sarcasm.

Good father cardinal, cry thou amen,

To my keen curses.

KEEN, verb transitive To sharpen. [Unusual.]