If she was mentally unstable, who's to say that you aren't too.

At the hospital, the doctors decided that he was mentally unstable.

Some of the people who manage to live down here are mentally unstable.

At the hospital, the doctors said he was mentally unstable.

"He gets mentally unstable when things don't go his way."

She became mentally unstable for the rest of her life.

A mentally unstable man then takes him and three others hostage.

Her performance of a mentally unstable woman was generally well received.

They can just make him appear to be mentally unstable, crazy.

They were separated because their father was mentally unstable and put away.