Synonyms for sharp

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Having a keen edge
acute, edged, keen, keen-edged, razor-edged, sharpened, ground fine, honed, honed to razor sharpness, razor-sharp, sharp-edged, fine, cutting, knifelike, knife-edged.
Antonyms dull*, unsharpened, blunt.
Having a keen point
pointed, keen, sharp-pointed, spiked, spiky, peaked, needle-pointed, keen, fine, salient, spiny, thorny, prickly, barbed, needlelike, briery, stinging, sharp as a needle, pronged, tapered, tapering, horned, unguiculate, acuate, acuminate, aculeate, muricate, aciculate, aciculated, aciculiform.
Having a keen mind
clever, astute, bright; see intelligent 1.
Having the ability to wound with words
caustic, biting, acrimonious; see sarcastic.
Not quite honest or honorable
crafty, designing, underhand; see sly 1.
Distinct
audible, visible, explicit; see clear 2, definite 2, obvious 1.
Vigilant
attentive, watchful, close; see observant 1, 2.
Intense
cutting, biting, piercing; see intense.
Vigorous
brisk, energetic, lively; see active 2.
*Excellent
fine, distinctive, first-class; see excellent.
*Stylish
dressy, chic, in style; see fashionable.

sharp and keen both apply to that which is cutting, biting, incisive, or piercing, as because of a fine edge, but sharp more often implies a harsh cutting quality a sharp pain, tongue, flavor, etc. and keen often suggests a pleasantly biting or stimulating quality keen wit, delight, etc. or a marked enthusiasm or intensity a keen student; acute literally implies sharp-pointedness and figuratively suggests a penetrating or poignant quality acute hearing, distress, etc. and often connotes suddenness and severity an acute heart attack

See sharp in Webster's New World Roget's A-Z Thesaurus II

adjective

Having a fine edge, as for cutting:
keen¹. See sharp
Having an end that tapers to a point:
acicular, aciculate, aciculated, acuminate, acute, cuspate, cuspated, cuspidate, cuspidated, mucronate, pointed, pointy. See sharp
Clearly defined; not ambiguous:
clear, distinct, unambiguous, unequivocal, unmistakable. See clear
Mentally quick and original:
alert, bright, clever, intelligent, keen¹, quick, quick-witted, sharp-witted, smart. Idiom: smart as a whip. See ability
Possessing or displaying perceptions of great accuracy and sensitivity:
acute, incisive, keen¹, penetrating, perceptive, probing, sensitive, trenchant. See careful, sharp
Deceitfully clever:
artful, crafty, cunning, foxy, guileful, scheming, sly, tricky, wily. See ability, honest, means
So sharp as to cause mental pain:
acerbic, acid, acidic, acrid, astringent, biting, caustic, corrosive, cutting, mordacious, mordant, pungent, scathing, slashing, stinging, trenchant, truculent, vitriolic. See attack, respect
Marked by severity or intensity:
acute, gnawing, knifelike, lancinating, piercing, shooting, stabbing. See big
Affecting the organs of taste or smell with a strong and often harsh sensation:
piquant, pungent, spicy, zesty. (Archaic) poignant. See smells, taste
(Informal)
Being or in accordance with the current fashion:
Ã la mode, chic, dashing, fashionable, mod, modish, posh, smart, stylish, swank, swanky, trig. (Informal) classy, in, snappy, swish, tony, trendy. (Slang) with-it. Idioms: all the rage, up to the minute. See style, usual

See sharp in American Heritage Dictionary 4 Synonyms

sharp keen ¹acute

These adjectives all apply literally to fine edges, points, or tips. Figuratively they indicate mental alertness and clarity of comprehension. Sharp suggests quickness and astuteness: “a young man of sharp and active intellect” (John Henry Newman).
Keen implies clear-headedness and acuity: a journalist with a keen mind and quick wits.
Acute suggests penetrating perception or discernment: an acute observer of national politics.

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