Synonyms for Annihilating (same or very similar meaning)
WordNet sense 1 (making light of):
devastating, witheringWordNet sense 2 (exhibiting lack of respect; rude and discourteous):
disrespectfulWordNet sense 3 (wreaking or capable of wreaking complete destruction):
annihilativeWordNet sense 4 (causing destruction or much damage):
destructiveFrom the ODE community, based on WordNetadd/edit