crackpot
/ˈkrækpɑt/
adjective
- Foolish, eccentric, or not sensible.
- She had a crackpot scheme to build a flying car in her garage.
- His crackpot plan to dig a tunnel to the other side of the world never got off the ground.
- The movie was full of crackpot ideas about time travel.
noun
- A person with strange, eccentric, or foolish ideas.
- The inventor was dismissed as a crackpot until his device actually worked.
- Don't listen to that crackpot; his theories have no scientific basis.
- Everyone thought he was a crackpot when he claimed he could talk to plants.