| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | bitter, sour to taste |
| Synonyms: | acid, amaroidal, astringent, biting, burning, caustic, harsh, irritating, pungent, sharp, stinging |
| Antonyms: | delicious, savory, sweet |
| Main Entry: | acerbic |
| Part of Speech: | adjective |
| Definition: | bitter, sharp, or sour |
| Synonyms: | acidic, acrid, astringent, caustic, harsh, sharp, tart |
| Main Entry: | acid |
| Part of Speech: | adjective |
| Definition: | having acidic, corrosive properties |
| Synonyms: | acerbic, acidulous, acrid, anti-alkaline, biting, bleaching, corroding, disintegrative, dissolvent, eating away, eroding, erosive, oxidizing, rusting |
| Antonyms: | basic |
| Main Entry: | alkaline |
| Part of Speech: | adjective |
| Definition: | being basic, not acid (chemically) |
| Synonyms: | acrid, alkalescent, alkali, antacid, bitter, caustic, neutralizing, salty, soluble |
| Main Entry: | astringent |
| Part of Speech: | adjective |
| Definition: | harsh |
| Synonyms: | acetic, acrid, biting, bitter, cutting, sharp, tonic |
| Antonyms: | bland, mild |
| Main Entry: | bitter |
| Part of Speech: | adjective |
| Definition: | pungent, sharp |
| Synonyms: | absinthal, absinthian, acerb, acerbic, acid, acrid, amaroidal, astringent, harsh, sour, tart, unsweetened, vinegary |
| Antonyms: | bland, mild, pleasant, sweet |
| Main Entry: | burning |
| Part of Speech: | adjective |
| Definition: | stinging, painful |
| Synonyms: | acrid, biting, caustic, irritating, painful, piercing, prickling, pungent, reeking, sharp, smarting, tingling |
| Main Entry: | caustic |
| Part of Speech: | adjective |
| Definition: | burning, corrosive |
| Synonyms: | abrasive, acerbic, acid, acrid, alkaline, astringent, biting, corroding, erosive, keen, mordant, pungent, tart |
| Antonyms: | calm, mild, soothing |
| Main Entry: | corrosive |
| Part of Speech: | adjective |
| Definition: | consuming, wearing; bitter |
| Synonyms: | acerb, acerbic, acrid, biting, caustic, corroding, cutting, destructive, erosive, incisive, sarcastic, strongly acid, trenchant, venomous, virulent, wasting |
| Antonyms: | contributing, fortifying, supporting |