caustically adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.

What is the adverb form of caustic?

caustically. In a caustic manner.

Is vitriolic an adjective?

Mean, nasty, and caustic as the worst acid, vitriolic words can hurt feelings, break hearts, and even lead to violence. Vitriolic is an adjective related to the noun vitriol — which means a metal sulphate.