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Wiktionary
mentally ill

a. Having a psychological disorder.

WordNet
mentally ill

adj. suffering from severe mental illness; "of unsound mind" [syn: unsound, unstable]

Usage examples of "mentally ill".

But again just as possible to remain as she'd first assessed it, a tragic apology from a mentally ill man who'd simply ended the single sheet, torn from an exercise or legal notebook, by writing his name.

But he was no mentally ill-adjusted adolescent or madman who did not know what he was doing.

A couple of others were general malcontents, arguably among the mentally ill.

I have seen multiple personalities before, but it was always because someone was mentally ill.

This provision basically held that if you committed a crime because you were mentally ill, you could be forced to seek treatment, but you could not be held legally responsible for your criminal actions.