noun
- a person who is eccentric, crazy, or mentally unstable
Usage: informal; derogatory; North American
Examples
- He drives like a nutball, swerving between lanes without signaling.
- My uncle is a total nutball—he collects vintage bottle caps and organizes them by color.
- That nutball tried to convince me the moon landing was fake.
- She's a nutball about horror movies; she watches them every single night.
- The nutball down the street keeps rearranging his lawn ornaments.