Noun

• S: (n) keen (a funeral lament sung with loud wailing)
• direct hypernym / inherited hypernym / sister term
• domain region
• derivationally related form

Verb

• S: (v) lament, keen (express grief verbally) "we lamented the death of the child"

Adjective

• S: (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"
• S: (adj) exquisite, keen (intense or sharp) "suffered exquisite pain"; "felt exquisite pleasure"
• S: (adj) bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, swell, smashing, old (very good) "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"; "we had a grand old time"
• S: (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"
• S: (adj) keen (having a sharp cutting edge or point) "a keen blade"