Synonyms for Insulting (same or very similar meaning)
WordNet sense 1 (expressing extreme contempt):
contemptuous, disdainful, scornfulWordNet sense 2 (exhibiting lack of respect; rude and discourteous):
disrespectfulWordNet sense 3 (expressing offensive reproach):
abusive, opprobrious, scurrilousWordNet sense 4 (causing anger or annoyance):
offensiveFrom the ODE community, based on WordNetadd/edit