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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:

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

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

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

eager, observant

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