vitriol (noun) - bitterness or hate expressed through harsh, critical language; sulfuric acid or metal sulfate [vi-tree-uhl]
BREAKDOWN: VITR- (glass) + -IOL (chemical)
vitriolic means scathing, hateful, or abusive, especially regarding criticism
“Anonymity is an abused privilege, abused most by people who mistake vitriol for wisdom and cynicism for wit.” —Danny Wallace