1. caustic

adjective. (ˈkɑːstɪk, ˈkɔstɪk) Harsh or corrosive in tone.
Synonyms
unpleasant acrid acerb vitriolic virulent bitter blistering sulphurous sulfurous acid acerbic
Antonyms
pleasant good-natured pleasing tasteless sweet

2. caustic

adjective. (ˈkɑːstɪk, ˈkɔstɪk) Of a substance, especially a strong acid; capable of destroying or eating away by chemical action.
Synonyms
mordant destructive vitriolic erosive corrosive
Antonyms
constructive inoffensive palatable unpleasantness nice

3. caustic

noun. (ˈkɑːstɪk, ˈkɔstɪk) Any chemical substance that burns or destroys living tissue.
Synonyms
chemical compound compound silver nitrate lye
Antonyms
nontoxic avirulent tolerable unresentful painless
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