Maltreat (verb)

1. To treat someone or something cruelly, brutally, or unjustly.
2. To abuse, mistreat or neglect someone or something.

Origin:

From the words "mal-" meaning "bad" and "treat" meaning "to deal with".

Examples:

1. He was accused of maltreating the prisoners under his charge.
2. She was maltreated by her husband.
3. The dog had been maltreated and was in poor condition when they found it.
4. The children were maltreated by their caregivers.
5. The employee was maltreated by her boss.