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Adjective keen has 6 senses
- 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"
 
Antonyms:  unperceptive, unperceiving (indirect, via perceptive) 
 - exquisite, keen - intense or sharp; "suffered exquisite pain"; "felt exquisite pleasure"
 
Antonym:  mild (indirect, via intense) 
 - incisive, keen, sharp - very penetrating and clear and sharp in operation; "an incisive mind"; "a keen intelligence"; "of sharp and active intellect"
 
Antonyms:  unintelligent, stupid (indirect, via intelligent) 
 - bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, swell, smashing - very good; "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"
 
Antonym:  bad (indirect, via good) 
 - cutting, keen, knifelike, piercing, stabbing, lancinate, lancinating - as physically 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"
 
Antonym:  dull (indirect, via sharp) 
 - keen - having a sharp cutting edge or point; "a keen blade"
 
Antonym:  dull (indirect, via sharp) 
  
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