Meaning of the word lunatic in English

What does lunatic mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

lunatic

US /ˈluː.nə.tɪk/
UK /ˈluː.nə.tɪk/

Noun

a person who is mad or behaves in a wild or foolish way

Example:
He drives like a lunatic.
Only a lunatic would try to climb that mountain in winter.

Adjective

wildly foolish or extravagant

Example:
That was a lunatic idea to jump off the bridge.
The plan seemed completely lunatic at first.