Vitriolic

[Sarah]

Of or pertaining to vitriol; derived from, or resembling,vitriol; vitriolous; as, a vitriolic taste. Cf. Vitriol. Vitriolicacid (Old Chem.), (a) sulphuric acid. See Vitriol (b). [Colloq.]

[Sarah]

1. N. One who is addicted to making vitriolic comments to others, often to the detriment of his/herself.

[Magaret]

full of violent hate and anger :

[Magaret]

Filled with bitter criticism or malice.