lunatic
/ˈluːnətɪk/
adjective
- Wildly foolish, crazy, or irrational.
- She had a lunatic laugh that made everyone in the room uncomfortable.
- It was a lunatic idea to build a house on the edge of a cliff.
- The dictator's lunatic policies led the country into ruin.
noun
- A person who behaves in a wild, crazy, or very foolish way.
- My brother is a lunatic when it comes to extreme sports—he'll try anything.
- The crowd thought the protester was a lunatic, but he was actually making a serious point.
- Only a lunatic would drive that fast on a rainy night.