148 synonyms for keen such as grieve, ambitious, attached to, acute, acute, honed, biting, acute, cry, and greet. Keen is an adjective, and its antonyms are reluctant and apathetic.
Ambitious, anxious, ardent, assiduous, avid, committed, conscientious, dedicated, desirous, determined, diligent, driven, dying, eager, earnest, enthusiastic, fervent, fervid, impassioned, impatient, industrious, intent, intent on, itching, longing, passionate, raring, ready, wholehearted, willing, wishing, yearning, zealous, and zestful.
Attached to, attracted to, crazy about, devoted to, eager for, enamoured of, enthusiastic about, fascinated by, fond of, gone on, hungry for, infatuated with, interested in, into, mad about, nuts about, passionate about, smitten with, struck on, sweet on, taken with, and twitterpated by.
Acute, clear, discerning, observant, penetrating, perceptive, piercing, powerful, sensitive, and sharp.
Acute, astute, brainy, bright, brilliant, canny, clever, discerning, finely honed, genius, incisive, insightful, intelligent, penetrating, perceptive, percipient, perspicacious, piercing, quick-witted, rapier-like, razor-like, razor-sharp, sagacious, sapient, sharp, sharp-witted, shrewd, smart, subtle, and wise.
Fine-edged, honed, razor-like, razor-sharp, sharp, sharp-edged, sharpened, and whetted.
Baltic, biting, bitter, cold, freezing, harsh, icy, penetrating, piercing, raw, sharp, and stinging.
Acute, ardent, burning, consuming, deep-seated, extreme, fervent, fervid, fierce, intense, passionate, powerful, profound, strong, and violent.
Cry, greet, grieve, groan, howl, lament, moan, mourn, plain, sob, sorrow, ululate, wail, weep, whimper, and whine.