
1) Acutest 2) Best-honed 3) Least dull 4) Most acute 5) Most astute 6) Most avid 7) Most clever 8) Most eager 9) Most enthusiastic 10) Most gung-ho 11) Most intense 12) Most interested 13) Most perceptive 14) Most piercing 15) Most sharp 16) Most zealous 17) Sharp to the max 18) Sharpest
Found on
https://www.crosswordclues.com/clue/keenest
No exact match found.