Vitriolic /(?)/

Vit·ri·ol·ic

Vitriolic

Of or pertaining to vitriol; derived from, or resembling, vitriol; vitriolous; as, a vitriolic taste. Cf. Vitriol. (Chem.)
Biting, bitter or caustic; having or expressing strong and unpleasantly negative feelings; -- of speech or feelings; the vitriolic denunciations of opponents by partisan columnists.