"caustic" in the noun sense
1. caustic
any chemical substance that burns or destroys living tissue
"caustic" in the adjective 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"
2. caustic, corrosive, erosive, vitriolic, mordant
of a substance, especially a strong acid capable of destroying or eating away by chemical action
Source: WordNet® (An amazing lexical database of English)
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