keen (adj)

a funeral lament sung with loud wailing

acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp (adj)

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"

exquisite, keen (adj)

intense or sharp

"suffered exquisite pain"; "felt exquisite pleasure"

bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad(p), peachy, slap-up, swell, smashing (adj)

very good

"he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"

cutting, keen, knifelike, piercing, stabbing, lancinate, lancinating (adj)

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"

keen (verb)

having a sharp cutting edge or point

"a keen blade"

lament, keen (verb)

express grief verbally

"we lamented the death of the child"