noun
- a person who is crazy or eccentric
Usage: informal; slang
adjective
- crazy or irrational
Usage: informal; slang
Examples
- He's a total nutso—he drives like he's in a race car.
- That idea is completely nutso; it will never work.
- My uncle is a nutso who collects vintage bottle caps.
- The weather has been nutso this week, with snow one day and sunshine the next.
- She went nutso when she found out she won the lottery.
- Don't listen to him; he's a nutso conspiracy theorist.