Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun caustic

1 sense of caustic

Sense 1
caustic -- (any chemical substance that burns or destroys living tissue)
       => compound, chemical compound -- ((chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight)

Antonyms of adj caustic

2 senses of caustic

Sense 1
acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic -- (harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts and medical ethics"; "a sulfurous denunciation"; "a vitriolic critique")

INDIRECT (VIA unpleasant) -> pleasant -- (affording pleasure; being in harmony with your taste or likings; "we had a pleasant evening together"; "a pleasant scene"; "pleasant sensations")

Sense 2
caustic, corrosive, erosive, vitriolic, mordant -- (of a substance, especially a strong acid; capable of destroying or eating away by chemical action)

INDIRECT (VIA destructive) -> constructive -- (constructing or tending to construct or improve or promote development; "constructive criticism"; "a constructive attitude"; "a constructive philosophy"; "constructive permission")

Similarity of adj caustic

2 senses of caustic

Sense 1
acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic -- (harsh or corrosive in tone; "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts and medical ethics"; "a sulfurous denunciation"; "a vitriolic critique")
       => unpleasant (vs. pleasant) -- (disagreeable to the senses, to the mind, or feelings ; "an unpleasant personality"; "unpleasant repercussions"; "unpleasant odors")

Sense 2
caustic, corrosive, erosive, vitriolic, mordant -- (of a substance, especially a strong acid; capable of destroying or eating away by chemical action)
       => destructive (vs. constructive) -- (causing destruction or much damage; "a policy that is destructive to the economy"; "destructive criticism")