The Collaborative International Dictionary of English v.0.48:
Ill-mannered \Ill`-man"nered\, a. Impolite; rude; displaying socially incorrect behavior. Syn: rude, unmannered, unmannerly. [1913 Webster]WordNet (r) 3.0 (2006):
ill-mannered adj 1: socially incorrect in behavior; "resentment flared at such an unmannered intrusion" [syn: ill-mannered, bad- mannered, rude, unmannered, unmannerly]