THESAURUS
acerbic
acerb, acerbate, acescent, acetose, acid, acidic, acidulent, acidulous, acrid, acrimonious, amaroidal, asperous, astringent, biting, bitter, bitter as gall, burning, caustic, choleric, coarse, corroding, corrosive, crab, crabbed, cutting, dry, embittered, escharotic, green, hard, harsh, incisive, irritating, keen, mordacious, mordant, nose-tickling, penetrating, pickled, piercing, piquant, poignant, pungent, rancorous, rankled, resentful, resenting, rough, scathing, scorching, sec, severe, sharp, sore, sour, sour as vinegar, soured, sourish, splenetic, stabbing, stewing, stinging, tart, tartish, trenchant, unripe, unsweet, unsweetened, vinegarish, vinegary, virulent, vitriolic, withering
ROGET THESAURUS
acerbic
Asceticism
N
asceticism, puritanism, sabbatarianism, cynicism, austerity, total abstinence, nephalism, mortification, maceration, sackcloth and ashes, flagellation, penance, fasting, martyrdom, ascetic, anchoret, anchorite, martyr, Heautontimorumenos, hermit, puritan, sabbatarian, cynic, sanyasi, yogi, ascetic, austere, puritanical, cynical, over-religious,
acerbic.
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.