Simple past tense and past participle of ill-treat. (verb)
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Use "ill-treated" in a sentence
"No better example perhaps than the impact of the ECHR on the actions of British forces in Iraq where the state has had to admit liability and pay millions in compensation to Iraqis ill-treated in UK custody and run a meaningful inquiry into what wentwrong."
"His was the face of an ill-treated and feeble-minded faun."
"It is an established right for society to step in between a man and his horse, but it is still abhorrent for a nation to step in between a handful of rulers and their millions of mismanaged and ill-treated subjects."