Maltreat, v. t. [imp. & p. p. Maltreated; p. pr. & vb. n. Maltreating.]
Etymology: [Mal- + treat: cf. F. maltraiter.]
To treat ill; to abuse; to treat roughly.
Shades of meaning
Fernald has no entry of its own for maltreat; he lists it under abuse.
He lists it without comment; the entries above explain its neighbors.