0 past participle, past simple of ill-treat
1 to treat someone badly, especially by being violent or by not taking care of them:
It is easy to work up enthusiasm when something fluffy and attractive is ill-treated.
There are many people who have been badly advised, ill-treated and fleeced.
By far the majority were cases of respectable, hardworking women who were being bullied, ill-treated, and neglected by cruel and drunken husbands.
On those broad facts it would appear that the librarians are not ill-treated.
Is it not a recognised fact that any soldier has the right to appeal to a higher officer if he thinks he is ill-treated?
They come from broken homes; they have been neglected, and in some cases even ill-treated.
Even when all these causes are removed, there will still be a number of cases where children are ill-treated.
I do not think you can produce a horse in beautiful condition if it has been brutally ill-treated.