Lunatic is a term referring to a person who is seen as mentally ill [1], dangerous, foolish, [2][3] or crazy [4] —conditions once attributed to "lunacy". The word derives from lunaticus meaning "of …

The meaning of LUNATIC is someone affected with a severely disordered state of mind. How to use lunatic in a sentence.

LUNATIC definition: 1. someone who behaves in a silly or dangerous way: 2. a word for a person who has a mental…. Learn more.

Definition of lunatic noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

lunatic, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

1. Affected by lunacy; mentally deranged. 2. Of or for people who are mentally deranged. 3. Wildly or giddily foolish: a lunatic decision.

A lunatic is someone who is either clinically insane or just acting really crazy. Someone driving too fast and zigging in and out of traffic is driving like a lunatic.

If you describe someone as a lunatic, you think they behave in a dangerous, stupid, or annoying way.

LUNATIC definition: (no longer in technical use; now considered offensive) an insane person. See examples of lunatic used in a sentence.

LUNATIC meaning: 1 : an insane person; 2 : a person who behaves in a very foolish way