lunatic

noun
UK: /ˈluːnətɪk/
US: /ˈluːnətɪk/

  1. A person who is mentally ill, or behaves in a crazy way.

    1. He drives like a lunatic! [ ] [ ]
    2. The man was behaving like a complete lunatic, shouting at everyone. [ ] [ ]

  2. Someone who is very foolish or dangerous.

    1. Only a lunatic would try that. [ ] [ ]
    2. You'd have to be a complete lunatic to go swimming in this weather! [ ] [ ]

Synonyms

maniac madman insane crazy
lunatic adjective

  1. Extremely reckless or wild.

    1. He had a lunatic grin. [ ] [ ]
    2. The car swerved across the road in a lunatic manner, nearly hitting us. [ ] [ ]

Frequently Asked Questions

The word "lunatic" in English means: A person who is mentally ill, or behaves in a crazy way., Someone who is very foolish or dangerous..

The phonetic transcription of "lunatic" is /ˈluːnətɪk/ in British English and /ˈluːnətɪk/ in American English. Click the 🔊 button to hear both pronunciations.

Synonyms for "lunatic": maniac, madman, insane, crazy.

Example usage of "lunatic": "He drives like a lunatic!". More examples on the page.