1. (adj) keen
a funeral lament sung with loud wailing
Antonyms: dull, unperceiving, mild, unperceptive, bad
2. (adj) acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp
having or demonstrating ability to recognize or draw fine distinctions
Synonyms: intense, penetrative, discriminating, shrill, neat, sharp, shrewd, lancinating, nifty, sharp-worded, not bad(p), bang-up, astute, incisive, acuate, dandy, tart, smashing, cutting, bully, precipitous, needlelike, slap-up, abrupt, keen, lancinate, knifelike, corking, exquisite, groovy, great, acute, piercing, penetrating, swell, cracking, crisp, stabbing, peachy
Antonyms: dull, bad, mild, unperceiving, unperceptive
3. (adj) exquisite, keen
intense or sharp
Synonyms: incisive, slap-up, cracking, neat, sharp, lancinating, dainty, cutting, swell, knifelike, great, keen, nifty, not bad(p), discriminating, bang-up, smashing, groovy, acute, corking, penetrating, recherche, exquisite, lancinate, piercing, bully, dandy, peachy, stabbing, penetrative
Antonyms: dull, unperceptive, mild, unperceiving, bad
4. (adj) bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad(p), peachy, slap-up, swell, smashing
very good
Antonyms: dull, mild, unperceiving, unperceptive, bad
5. (adj) cutting, keen, knifelike, piercing, stabbing, lancinate, lancinating
painful as if caused by a sharp instrument
Synonyms: slap-up, cracking, neat, sharp, lancinating, wounding, incisive, cutting, peachy, swell, knifelike, corking, bully, keen, dandy, nifty, smashing, not bad(p), raw, discriminating, bang-up, acute, groovy, lancinate, stinging, edged, exquisite, penetrating, piercing, bleak, great, stabbing, penetrative
Antonyms: dull, bad, unperceptive, unperceiving, mild
6. (verb) keen
having a sharp cutting edge or point
Synonyms: slap-up, cracking, neat, sharp, lancinating, incisive, cutting, swell, knifelike, great, nifty, not bad(p), discriminating, bang-up, smashing, groovy, acute, corking, penetrating, exquisite, lancinate, piercing, bully, dandy, peachy, stabbing, penetrative
Antonyms: dull, bad, unperceptive, unperceiving, mild
7. (verb) lament, keen
express grief verbally
Synonyms: lament, deplore, keen, bemoan, bewail
Antonyms: dull, mild, bad, unperceiving, unperceptive
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Synonyms and Antonyms of keen 
