The Collaborative International Dictionary of English v.0.48:
Illtreat \Ill`treat"\, v. t. To treat cruelly or improperly; to ill use; to maltreat. Syn: mistreat, maltreat, abuse, ill-use. [1913 Webster]WordNet (r) 3.0 (2006):
ill-treat v 1: treat badly; "This boss abuses his workers"; "She is always stepping on others to get ahead" [syn: mistreat, maltreat, abuse, ill-use, step, ill-treat]