1. Exhibiting lack of respect; rude and discourteous
   "remarks disrespectful of the law"; "disrespectful in the presence of his parents"; "disrespectful toward his teacher" 
2. Neither feeling nor showing respect
   - aweless, awless

See also: annihilating, contemptuous, contumelious, derisive, devastating, discourteous, disdainful, disrespectfully, flip, gibelike, immodest, impious, impudent, insolent, insulting, irreverent, jeering, mocking, offensive, sarcastic, scornful, snotty-nosed, taunting, undeferential, undutiful, withering

Antonym: respectful

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