Source : Webster's Revised Unabridged Dictionary (1913)

Maltreat \Mal*treat"\, v. t. [imp. & p. p. {Maltreated}; p. pr.
   & vb. n. {Maltreating}.] [Mal- + treat: cf. F. maltraiter.]
   To treat ill; to abuse; to treat roughly.

Source : WordNet®

maltreat
     v : treat badly; "This boss abuses his workers"; "She is always
         stepping on others to get ahead" [syn: {mistreat}, {abuse},
          {ill-use}, {step}, {ill-treat}]