ILL-TREAT Meaning of ILL-TREAT in English 25B6; verb ABUSE, mistreat, maltreat, ill-use, misuse; manhandle, handle roughly, molest; harm, injure, damage; informal knock about/around. pamper. Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012