[ˈluːnətɪk], (Noun)

Definitions:
- an extremely irrational, eccentric, or foolish person
(e.g: this lunatic just accelerated out from the side of the road)

- a person with a mental illness


Phrases:
- the lunatics have taken over the asylum

Origin:
Middle English: from Old French lunatique, from late Latin lunaticus, from Latin luna ‘moon’ (from the belief that changes of the moon caused intermittent insanity)

[ˈluːnətɪk], (Adjective)

Definitions:
- extremely irrational, impractical, or foolish
(e.g: the lunatic ideas in his opinion piece are astounding)

- having a mental illness


Phrases:
- the lunatics have taken over the asylum

Origin:
Middle English: from Old French lunatique, from late Latin lunaticus, from Latin luna ‘moon’ (from the belief that changes of the moon caused intermittent insanity)