keen

[1]

lament

adj.

[1]	enthusiastic , avid , zealous , devoted , ardent , fervent , fervid , earnest , impassioned , passionate , intense , active , agog , eager , itching , anxious
[2]	sharp , sharpened , razor-sharp , razor-like , knife-edged , trenchant , incisive , cutting , rapier-like , pointed , mordant , acid , vitriolic , acerbic , astringent , biting , acrid , acrimonious , stinging , scorching , caustic , searing , withering , virulent , pungent , sarcastic , sardonic
[3]	painful , acute , discriminating , bitter , acute , incisive , knifelike , poignant , fierce , penetrating , penetrative , grievous , severe , piercing , sharp , distressing , distressful , strong , deep , profound , intense , extreme , heartfelt
[4]	vivid , exquisite , detailed , specific , unmistaken , unmistakable/unmistakeable , distinct
[5]	sharp , bang-up , bully , acute , sensitive , corking , cracking , penetrating , discriminating , dandy , great , fine , groovy , neat , nifty , not bad , peachy , slap-up , swell , smashing
[6]	cutting , intelligent , sharp , knifelike , acute , piercing , stabbing , perceptive , perspicacious , lancinate , lancinating , percipient , sensitive , discerning , astute , smart , bright , discriminating , discriminative , quick(-witted) , shrewd , clever , canny , cunning , crafty , wise
[7]	keen on/about , fond of , enamoured of , devoted to , interested in