Nutter (noun)

A slang term used to refer to a person who is considered to be crazy or insane.

Origin:

Slang, origin unknown, possibly from nut (insane person) or from a sense of "screwed up".

Examples:

1. The patient was considered a nutter, and was often heard talking to himself.
2. The criminal was deemed a nutter, and was locked up in a secure facility.
3. The patient was discharged from the hospital, but was considered a nutter by the staff.
4. He"s a bit of a nutter, but he"s got a heart of gold.
5. The patient's behavior was so erratic that many people considered him a nutter.