| keen | (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, neat, nifty, not bad, old, peachy, slap-up, smashing, swell |
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| (adjective) intense or sharp | Synonyms: exquisite |
| (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, knifelike, penetrating, penetrative, piercing, sharp |
| (adjective) having a sharp cutting edge or point | - |
| (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, knifelike, lancinate, lancinating, piercing, stabbing |
| (noun) a funeral lament sung with loud wailing | - |
| (verb) express grief verbally | Synonyms: lament |
| keenly | (adverb) in a keen or penetrating way | Synonyms: acutely |
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| keenness | (noun) thinness of edge or fineness of point | Synonyms: sharpness |
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| (noun) a quick and penetrating intelligence | Synonyms: acuity, acuteness, sharpness |
| (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidity, avidness, eagerness |