keen - noun

a funeral lament sung with loud wailing

keen - verb

• express grief verbally

keen - adjective

• having or demonstrating ability to recognize or draw fine distinctions
• intense or sharp
• very good
• painful as if caused by a sharp instrument
• having a sharp cutting edge or point

keen - thesaurus

acute   bully   corking   cracking   cutting   dandy   discriminating   exquisite   great   groovy   incisive   knifelike   lament   lancinate   lancinating   neat   nifty   peachy   penetrating   penetrative   piercing   sharp   smashing   stabbing   swell