Synonyms for Sharp:

adj.

abrasive (adjective)
spiky.
active (adjective)
lively.
attentive (adjective)
absorbed, alert, attentive, careful, cautious, concerned, diligent, engrossed, enraptured, entranced, fascinated, heedful, intent, interested, mindful, observant, observing, rapt, regardful, responsible, vigilant, watchful, Hearkening, Immersed, Scrutinizing, Concentrating, Considering.
cold (adjective)
chilly.
conical (adjective)
tapering.
cunning (adjective)
calculating, designing, devious, feline, masterful, masterly, scheming, serpentine, skillful, slick, slippery, smooth, snaky, wary, artful, astute, canny, clever, crafty, cunning, deft, foxy, ingenious, quick, shrewd, sly, subtle, tricky, wily, witty.
excellent (adjective)
distinctive, excellent, fine, first class.
extreme (adjective)
high.
fashionable (adjective)
chic, stylish.
intelligent (adjective)
brainy, bright, capable, cogent, encyclopedic, erudite, genius, gifted, intellectual, knowing, knowledgeable, perspicacious, profound, sagacious, wise, worldly, Comprehending, astute, brilliant, canny, clever, incisive, intelligent, keen, smart, sophisticated.
mordant (adjective)
mordant.
painful (adjective)
stinging.
plush (adjective)
swanky.
pungent (adjective)
acrid, poignant, spicy, tangy, bitter, caustic, piquant, pungent, sour.
rough (adjective)
chapped.
severe (adjective)
abrupt, acerbic, acrimonious, acute, ascetic, astringent, austere, authoritarian, basic, bleak, blunt, brisk, brusque, caustic, censorious, chilly, cool, correct, crisp, critical, curt, cutting, demanding, disciplined, dour, draconian, dry, exacting, frosty, fundamental, grim, gruff, harsh, hidebound, icy, imperial, inflexible, intense, intolerant, keen, lean, meticulous, obdurate, obstinate, oppressive, piquant, precise, prudish, puritanical, raw, relentless, rigid, rigorous, severe, short, spare, spartan, stark, stern, stiff-necked, strict, stringent, tart, unbending, uncompromising, strait-laced.
sharp (adjective)
abrupt, acerbic, aciculate, acid, acrid, acrimonious, active, acuate, acuminate, acute, adroit, agonizing, alert, angry, artful, astringent, astute, audible, austere, barbed, biting, bitter, brainy, briery, bright, brilliant, brisk, bristly, burning, canny, caustic, chic, classy, clear, clever, crafty, crisp, critical, cunning, cuspate, cuspidate, cutting, dashing, definite, designing, discriminating, distinct, distinctive, double-edged, dressy, edged, excellent, explicit, fashionable, fine, harsh, incisive, ingenious, intelligent, intense, jagged, keen, knifelike, knowing, lively, observant, obvious, peaked, penetrating, penetrative, piercing, piquant, pointed, prickly, pungent, quick, razor-sharp, resourceful, sagittal, salient, sarcastic, scathing, sensitive, serrated, severe, sharpened, shooting, short, shrewd, slick, slippery, sly, smart, snaky, sour, spiked, spiky, spinous, spiny, stabbing, stinging, subtle, swank, tapering, tart, thorny, trenchant, trendy, underhand, unscrupulous, visible, vitriolic, wily, wise, Thistly, Tony, needle-like, needle-point, pointy, razor-edged, spear-like.
short (adjective)
short.
sour (adjective)
acidic, bitter, pungent, sour, unripe, acerb, acerbic, piquant, tart.
stylish (adjective)
modernistic, chic, dressy, fashionable.
trenchant (adjective)
razor-sharp.
vigilant (adjective)
close.
vigorous (adjective)
active, energetic, lively.
witty (adjective)
adroit, artful, astute, brilliant, canny, clever, comical, crafty, cunning, deft, droll, facetious, foxy, funny, ingenious, intelligent, inventive, jocular, joking, pithy, quick, quick-witted, resourceful, sarcastic, scintillating, scurrilous, shrewd, sly, smart, sophisticated, sparkling, subtle, tricky, urbane, waggish, wily, witty, dry, pointed.

adv.

all (adverb)
sharply.
sharp (adverb)
on the dot, promptly.

n.

beat, chord, crotchet, dull, fine, B, C, D, double flat, DO. able, academic, aciculate, acuminate, briery, peaked, salient, stinging, tapering, Aciculated. about, around, back, backward, biting, down, onward, outside, up, Against. achy, agonising, agonizing, angry, bad, burning, chapped, chronic, crippling, underhand. bittersweet, brackish, chocolate, fiery, flavored, chocolatey. acicular, acoustic, atonal, bass, classical, cuspate, cuspated, cuspidate, cuspidated, discordant, flat, funky, harmonic, harmonious, Mucronate, bluesy. affective, blind, casual, clear, deep, deep-seated, depth, unambiguous, unequivocal, unmistakable. ability, adagio, allegro, andante, bar, bar line, bass clef, clef, con brio, Sharp-witted, ARR, con amore. advanced, contemporary, futuristic, modern, modernistic, probing, sensitive, space age, trenchant, up-to-the-minute, state of the art, ahead of your/its etc. time. alternative, conflicting, contrasting, different, dissimilar, divergent, diverse, guileful, honest, means, unlike, various. acid, annoyed, attack, belligerent, corrosive, cross, displeased, fed up, irritated, mad, mordacious, mordant, put out, respect, scathing, slashing, truculent, upset, vitriolic. big, deafening, loud, noisy, resounding, riotous, shooting, uproarious, Ear-splitting, Gnawing, can't hear yourself think. apparent, identifiable, manifest, noticeable, perceptible, plain, show up, taste, zesty. arterial, chic, classy, dashing, fashionable, feeder, impassable, in, mod, modish, one-way, passable, posh, slow, style, stylish, swank, swanky, swish, tight, trendy, trig, two-way, usual, Tony, with-it. corrupt, deceitful, dishonest, dubious, unprincipled, unscrupulous, untruthful. away, cosmetic, developmental, drastic, evolutionary, gradual, gradually, quicksilver, radical, radically. double-edged, left-handed, razor-sharp, serrated, Two-edged. black ice, frost, frozen, hard, ice over, icicle, glare ice. breathless, bronchial, chesty, choke, deeply, heavily, indrawn, labored, pulmonary. chromatic, diatonic, major, minor, tonic. duly, in time, just in time, on the dot, prompt, promptly, punctual, well-timed. distinct (noun)
audible, clear, definite, explicit, obvious, visible.
intense (noun)
biting.
sharp (noun)
abrupt, acerb, acerbic, acuate, acute, astringent, astute, carnassial, crisp, cutting, discriminating, distinct, edged, forceful, fulgurating, high, high-pitched, incisive, intelligent, intense, keen, knifelike, lancinate, lancinating, penetrating, penetrative, perceptive, piercing, precipitous, salt, scratching, sharp-worded, sharpened, sharply, shrewd, shrill, smart, sour, stabbing, steep, sudden, tart, unpleasant.

Other synonyms:

acicular, aciculate, acuminate, black ice, briery, chic, chromatic, classy, cuspate, cuspated, cuspidate, cuspidated, diatonic, fashionable, guileful, ice over, icicle, impassable, just in time, mod, mordacious, probing, punctual, serrated, trenchant, trig, unambiguous, well-timed, zesty, Aciculated, Gnawing, Mucronate, Tony, glare ice. active, arterial, corrosive, definite, double-edged, duly, frost, frozen, left-handed, posh, scathing, slashing, stylish, trendy, unequivocal, unmistakable, Sharp-witted, with-it, Two-edged. feeder, one-way, promptly, razor-sharp, shooting, two-way. dashing, minor, modish, truculent. in, prompt. major, tight, tonic. hard. biting
vitriolic.
caustic
burning.
discernible
clear.
distinct
distinct.
high-pitched
high-pitched.
stringent
mordant.
up-to-date
modern.
Other relevant words:
beat, biting, classy, double-edged, edged, fine, incisive, knifelike, penetrating, perceptive, piercing, precipitous, prompt, scathing, shooting, shrill, stabbing, steep, stinging, trenchant, Gnawing.

Usage examples for sharp

  1. And look sharp about it, and don't keep them waiting. – Old Peter's Russian Tales by Arthur Ransome
  2. Macallister gave him a sharp glance. – The Coast of Adventure by Harold Bindloss
  3. " Then he'd better look sharp after the will," said Undershaw, with a smile. – The Mating of Lydia by Mrs. Humphry Ward