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Definition of keen:

  1. A prolonged wail for a deceased person. Cf. Coranach.
  2. Acute of mind; sharp; penetrating; having or expressing mental acuteness; as, a man of keen understanding; a keen look; keen features.
  3. Bitter; piercing; acrimonious; cutting; stinging; severe; as, keen satire or sarcasm.
  4. Eager; vehement; fierce; as, a keen appetite.
  5. Piercing; penetrating; cutting; sharp; - applied to cold, wind, etc, ; as, a keen wind; the cold is very keen.
  6. Sharp; having a fine edge or point; as, a keen razor, or a razor with a keen edge.
  7. To sharpen; to make cold.
  8. To wail as a keener does.

Synonyms:

needlelike, desperate, brave, penetrating, longing, subtle, serious, hepped up, good, choice, piercing, intent, ardent, capital, pumped, antsy, acute, athirst, distinguish, fantastical, excited, knowing, dynamite, topping, heavy, intense, exquisite, smashing, boss, crazy, eager, sterling, A-OK, high-class, discerning, solicitous, clear-sighted, bemoan, easterly, enthusiastic, smart, sharp-worded, careful, hopped-up, biting, sagacious, impatient, ferocious, perceptive, five-star, gilt-edged, anxious, ripping, A1, extreme, grave, boffo, peachy, fearsome, avid, supersmart, lancinating, alert, dire, chime, fierce, noble, groovy, clever, frontline, prize, bumper, almighty, hype, clever, first-string, peep, enthusiastic, edgy, violent, cracking, ability, agog, discriminating, corking, top-of-the-line, sensational, beautiful, quality, dainty, nimble, bright, hungry, bewail, radical, stoked, excruciating, wild, be dying for something/to do something, intensive, geeked, terrible, peachy keen, tip-top, first-rate, bitter, superlative, fine, gangbusters, dope, primo, great, heavenly, stropped, intelligent, whetted, incisive, jim-dandy, insightful, kinaesthetic, four-star, smarting, bleep, gale-force, warm, glorious, bright, fab, creak, top, top-shelf, interested, raring, down, shrill, perspicacious, furious, profound, deplore, swell, in need of something, wonderful, left-handed, prizewinning, top-notch, cutting, concern, number one, quick-witted, wizard, two-edged, gusty, strong, fearful, brilliant, sensation, mad, famous, quick, hard, classic, voracious, clink, fantastic, blue-chip, dreamy, sharp, chink, gung ho, judicious, immense, enthused, par excellence, dull, probing, mean, vicious, gone, not bad, brag, ultrasmart, slap-up, bursting, penetrative, sharp-witted, desirous, rabid, bang-up, sound, the Beaufort scale, cunning, double-edged, acuate, nifty, grand, in the hope that/of, delicate, perceive, intellectual, stinging, knifelike, lovely, fervent, serrated, superb, awesome, nuts, prime, hyperintelligent, zealous, sensitive, frightful, awful, fabulous, meditative, ardent, perception, splendid, razor-sharp, exceptional, superior, lament, force, urgent, precipitous, vehement, phat, honed, bonny, mewl, numero uno, blistering, greedy, explosive, terrific, blue-ribbon, assail, east, reasoned, out-of-sight, stabbing, dreadful, crafty, first-class, top-flight, wounding, heavy-duty, beep, thirsting, marvelous, bully, ground, tremendous, supernal, juiced, fast, crackerjack, brainy, thoughtful, dandy, lancinate, thirsty, divine, gentle, stellar, subtile, deep, assault, hellacious, fantabulous, following, neat, ghastly, hot, click, deductive, banner, slick, righteous, trenchant, edged, sense, shrewd, astute, super, recherche, sharpened, unsurpassed.

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