Synonyms of acid in English:

acid


See US English definition of acid

See UK English definition of acid

See Spanish definition of ácido

adjective

1‘a very juicy fruit with a slightly acid flavour’

SYNONYMS
acidic, sour, tart, bitter, unsweetened, sharp, biting, acrid, pungent, acerbic, vinegary, vinegarish, acetic, acetous
rare acidulous, acidulated
ANTONYMS

sweet

2‘she was prone to making acid remarks’

SYNONYMS
acerbic, sarcastic, sharp, sardonic, satirical, scathing, cutting, razor-edged
incisive, penetrating, piercing, biting, stinging, searing
keen, caustic, trenchant, mordant, bitter, acrimonious, astringent
harsh, severe, abrasive, wounding, hurtful, unkind, cruel, vitriolic, virulent, venomous, poisonous, waspish, spiteful, vicious, malicious
North American acerb
informal bitchy, catty
British informal sarky
North American informal snarky
rare mordacious, acidulous
ANTONYMS

kind, pleasant, complimentary