Lunatic meaning

lo͝onə-tĭk
Frequency:
Utterly foolish.
adjective
3
1
Affected by lunacy; mentally deranged.
adjective
2
2
Of or for insane persons.
adjective
2
2
The definition of a lunatic is a person who is either actually crazy or who is acting crazy and wild in his behavior.

A crazy person is an example of a lunatic.

A person who behaves in a really wild and bizarre manner is an example of a lunatic.

noun
1
0
An insane person.
noun
1
1
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Lunatic is defined as someone or something that is wild, crazy or absurd.

Wild and crazy behavior is an example of something that would be described as lunatic behavior.

adjective
0
1
A person who is affected by lunacy; a mentally deranged person.
noun
0
1
A very foolish person.
noun
0
1
Of or for people who are mentally deranged.
adjective
0
1
Wildly or giddily foolish.

A lunatic decision.

adjective
0
1
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Suffering from lunacy; insane.
adjective
0
1
Of or characterized by lunacy.
adjective
0
1
An insane person.
noun
0
1
adjective
0
1

Other Word Forms

Noun

Singular:
lunatic
Plural:
lunatics

Origin of lunatic

  • Middle English lunatik from Old French lunatique from Latin lūnāticus from lūna moon (from the belief that madness was influenced by the phases of the moon) leuk- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French lunatique, from Late Latin lunaticus ("moonstruck"), derived from Latin luna ("moon").

    From Wiktionary