1. mistreat, maltreat, abuse, ill-use, step, ill-treat, treat, handle, do by
usage: treat badly; "This boss abuses his workers"; "She is always stepping on others to get ahead"
2. pervert, misuse, abuse, use, expend
usage: change the inherent purpose or function of something; "Don't abuse the system"; "The director of the factory misused the funds intended for the health care of his workers"
usage: use foul or abusive language towards; "The actress abused the policeman who gave her a parking ticket"; "The angry mother shouted at the teacher"
4. abuse, use, expend
usage: use wrongly or improperly or excessively; "Her husband often abuses alcohol"; "while she was pregnant, she abused drugs"
Adjective
1. abused, misused (vs. used)
usage: used improperly or excessively especially drugs; "an abused substance"