THESAURUS
Acrid
acerb, acerbate, acerbic, acid, acidic, acidulent, acidulous, acrimonious, acute, amaroidal, antagonistic, antipathetic, asperous, astringent, austere, belligerent, biting, bitter, bitter as gall, caustic, clashing, cloying, coarse, colliding, conflicting, corroding, corrosive, cutting, despiteful, double-edged, edged, escharotic, featheredged, fierce, fine, full of hate, hard, harsh, hateful, hostile, incisive, irritating, keen, keen-edged, knifelike, malevolent, malicious, malignant, mordacious, mordant, nose-tickling, oversweet, penetrating, piercing, piquant, poignant, pungent, quarrelsome, rancorous, razor-edged, repugnant, rigorous, rough, saccharine, scathing, scorching, set, set against, severe, sharp, sore, sour, spiteful, stabbing, stinging, strident, stringent, tart, trenchant, two-edged, vehement, venomous, violent, virulent, vitriolic, withering
ROGET THESAURUS
Acrid
Pungency
N
pungency, piquance, piquancy, poignancy haut-gout, strong taste, twang, race, sharpness, acrimony, roughness, unsavoriness, mustard, cayenne, caviare, seasoning, niter, saltpeter, brine (saltiness), carbonate of ammonia, sal ammoniac, sal volatile, smelling salts, hartshorn (acridity), dram, cordial, nip, nicotine, tobacco, snuff, quid, smoke, segar, cigar, cigarette, weed, fragrant weed, Indian weed, Cavendish, fid, negro head, old soldier, rappee, stogy, pungent, strong, high-, full-flavored, high-tasted, high-seasoned, gamy, sharp, stinging, rough, piquant, racy, biting, mordant, spicy, seasoned, hot, hot as pepper, peppery, vellicating, escharotic, meracious, acrid, acrimonious, bitter, rough, unsavory.
Bitterness
N
bitterness, acridness, acridity, acrimony, caustic, alkali, acerbity, gall, wormwood, bitters, astringent bitters, Angostura, aromatic bitters, sourness, pungency, alkaloids, turmeric, bitter, bitterish, acrid, acerb, acerbic, bitter as gall, bitter pill to take, sugar coating on a bitter pill.
Unsavoriness
N
unsavoriness, amaritude, acrimony, acridity (bitterness), roughness, acerbity, austerity, gall and wormwood, rue, quassia, aloes, marah, sickener, unsavory, unpalatable, unsweetened, unsweet, ill-flavored, bitter, bitter as gall, acrid, acrimonious, rough, offensive, repulsive, nasty, sickening, nauseous, loathsome, fulsome, unpleasant.
Acridity
N
acridity, astringency, bite, tear gas, smoke, acrid fumes, acrid, biting, astringent, sharp, harsh, bitter, (5) Sound (i) SOUND IN GENERAL.