caustic
— Adjective
– English
～ of a substance, especially a strong acid; capable of destroying or eating away by chemical action
caustic
— Adjective
– English
～ 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"
caustic
— Noun
– English
～ any chemical substance that burns or destroys living tissue
caustically
— Adverb
– English
～ in a caustic vitriolic manner; "he addressed her caustically"