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.]
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI