Third-person singular simple present indicative form of ill-use

Poorly informed; ignorant.

Alternative form of it's an ill wind that blows nobody any good

The property of being ill-formed.

Poorly formed. / (linguistics, computing) Not well-formed.

In an ill-judged manner; unwisely

disaffected

Someone who wishes harm on someone else.

Badly judged, unwise, rash.

Badly matched or unmatched