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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:

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

enthusiastic (part of speech: adjective)

hooked, motivated, wholehearted, mad about something, born-again

severe (part of speech: adjective)

demanding, rigid, austere, fundamental, gruff, rigorous, brusque, dry, uncompromising, precise, curt, piquant, correct, brisk, chilly, obstinate, icy, stiff-necked, bleak, obdurate, disciplined, cutting, spare, stringent, hidebound, blunt, caustic, censorious, lean, cool, tart, exacting, basic, acute, sharp, ascetic, acerbic, imperial, raw, astringent, prudish, meticulous, severe, frosty, Spartan, Draconian, harsh, acrimonious, unbending, intense, puritanical, oppressive, intolerant, critical, authoritarian, short, abrupt, strict, stern, relentless, stark, inflexible, crisp, grim, strait-laced, dour

sharp (part of speech: adjective)

pointed, jagged, spear-like, sagittal, needle-like, bristly, spiky, razor-edged, spinous, spiny, thistly, thorny, needle-point, prickly, pointy, barbed, spiked

sensitive (part of speech: adjective)

eager, observant

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