Synonyms for Keen:
adj.
•critical (adjective)discriminating.
•dry (adjective)
thirsty.
•enthusiastic (adjective)
gung ho, zealous, avid, athirst, born-again, thirsty, interested, alert, ardent, agog, hooked, fervent, intense, impatient, intent, wholehearted, mad about something, warm, motivated, eager.
•impressionable (adjective)
sensitive.
•intelligent (adjective)
quick, sensitive, sharp, clever, penetrating, incisive, discriminating, bright.
•knifelike (adjective)
knifelike.
•raring (adjective)
raring.
•sensitive (adjective)
observant, eager.
•sharp (adjective)
spiny, needle-like, prickly, spear-like, pointed, stabbing, thorny, needle-point, acute, bristly, razor-sharp, cutting, razor-edged, jagged, barbed, spiky, pointy, spinous, lancinating, sagittal, sharp, spiked, Thistly.
•sharp, piercing (adjective)
observant, cutting, extreme, acute, strong, penetrating, caustic, pointed, incisive, tart, perceptive, trenchant, razor-sharp, quick-witted.
•worried (adjective)
solicitous.
n.
clever, sensation, perceive, quick-witted, quick, kinaesthetic, assail, perception, assault, smart, ability, sense, distinguish, bright, Sharp-witted, alert. meditative, deductive, sound, probing, thoughtful, reasoned, insightful, sensitive, trenchant, intellectual, careful. fantastical, wonderful, mewl, terrific, beep, splendid, clink, fantastic, glorious, dreamy, chime, tremendous, ripping, bleep, hot, divine, super, sensational, chink, marvelous, peep, click, fabulous, creak, superb. •astute (noun)clever, judicious, bright.
•eager (noun)
interested, intent, enthusiastic, ardent.
•intense (noun)
extreme, strong, biting.
•keen (noun)
knifelike, great, intense, stabbing, good, swell, incisive, not bad, lancinate, neat, perceptive, cutting, lament, groovy, nifty, intelligent, discriminating, piercing, penetrative, sharp, bully, exquisite, smashing, acute, corking, lancinating, penetrating, peachy, slap-up, bang up, cracking, dandy.
v.
•emotion (verb)lament.
Other synonyms:
kinaesthetic, chime, athirst, probing, assail, Thirsting, mewl, trenchant, clink, urgent, perceive, serrated, agog, thoughtful, ripping, gung ho, observant, raring, distinguish, bleep, creak. longing, left-handed, sensation, Sharp-witted, perception, warm, Two-edged, desperate, assault, double-edged. marvelous, tremendous, beep, solicitous, razor-sharp, nuts. fabulous, dreamy, chink, bursting, alert, sense, peep, sensational, wonderful. glorious, click. fantastical. fantastic. •acidulous
biting.
•alert
quick.
•bang-up
bang up.
•cry
mewl.
•eager
avid.
•fanatical
rabid.
•intense
strong.
•Other relevant words:
lament, eager, peachy, nifty, biting, hot, perceptive, bully, piercing, exquisite, penetrating, bright, dandy, knifelike, quick, agog, smart, ripping, great, fervent, double-edged, ardent, avid, clever, strong, alert, swell, stabbing, zealous, incisive, slap-up, trenchant, enthusiastic.