1. (adj) keen
a funeral lament sung with loud wailing
2. (adj) acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp
having or demonstrating ability to recognize or draw fine distinctions
"an acute observer of politics and politicians"; "incisive comments"; "icy knifelike reasoning"; "as sharp and incisive as the stroke of a fang"; "penetrating insight"; "frequent penetrative observations"
3. (adj) exquisite, keen
intense or sharp
"suffered exquisite pain"; "felt exquisite pleasure"
4. (adj) bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad(p), peachy, slap-up, swell, smashing
very good
"he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"
5. (adj) cutting, keen, knifelike, piercing, stabbing, lancinate, lancinating
painful as if caused by a sharp instrument
"a cutting wind"; "keen winds"; "knifelike cold"; "piercing knifelike pains"; "piercing cold"; "piercing criticism"; "a stabbing pain"; "lancinating pain"
6. (verb) keen
having a sharp cutting edge or point
"a keen blade"
7. (verb) lament, keen
express grief verbally
"we lamented the death of the child"
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Definition of 'KEEN' 
