WordNet sense 1 (harshly ironic or sinister):

black, grim

WordNet sense 2 (expressing or expressive of ridicule that wounds):

sarcastic

WordNet sense 3 (of a substance, especially a strong acid; capable of destroying or eating away by chemical action):

caustic, corrosive, erosive, vitriolic

WordNet sense 4 (causing destruction or much damage):

destructive