The Collaborative International Dictionary of English v.0.48:
ill-treatment \ill-treatment\ n. cruel or inhumane treatment. Syn: maltreatment, ill-usage, abuse. [WordNet 1.5]WordNet (r) 3.0 (2006):
ill-treatment n 1: cruel or inhumane treatment; "the child showed signs of physical abuse" [syn: maltreatment, ill-treatment, ill-usage, abuse]