keen

ablest active acute acute admirable anxious appreciative ardent astute athirst avid bright bright brighter brighter brightest brightest brisk caustic chipper chomping at the bit clever cleverest coldest cold conscious cool coolest covetous crafty crazy crazier craziest cried cries cry cunning dandy dashing deep desirous dirge discriminating dry eager earnest enterprising enthusiastic exquisite fine fresh fresher freshest gay glowing gnarly gnawing grieve groan groaned groaning hot hottest hotter howled howl hungry impatient incisive insightful intelligent intense interested ironic ironic/ironical judicious knifelike lament/lamentation lamentations laments lancinating livelier lively mad maddest marvelous moaned moan more active more acute more acute more astute more conscious more eager more interested more intelligent more ironical more ironic more ironic most appreciative most astute most interested most ironic most ironic most ironical most sagacious most sapient mourn mourned mucronate nifty nuts/nutty nutser nutsest nuttiest nuttiest nuttier nuttier nutty observant observing peaches-and-cream penetrating peppy peppery perceptive perspicacious pert piercing poignant pointed pointed pointy probing profound pungent quick quick quicker quicker quick-witted quickest quickest rabid racy raring ready ready ripping ruminative sagacious sapient savviest savvier savvy sensational sensitive sharp-witted sharp sharp sharp shivery shrewd shrewdest smart smarter smartest solicitous sour spicy spirited sprightly stabbing subtle super susceptive swell terrific thirsting thirsty thoughtful trenchant tricky ululate ululation unforbearing vigilant vivacious wail wailed warm warmest watchful weep wept wise wiser wisest wishful witty would-be youthful zealous