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Learn to pronounce lu·na·cy

/ˈlo͞onəsē/
noun
the state of being a lunatic; insanity (not in technical use).
"it has been suggested that originality demands a degree of lunacy"
synonyms: insanity, madness, mental illness, derangement, dementia, dementedness, insaneness, loss of reason, unsoundness of mind, mental instability, mania, frenzy, psychosis, craziness

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insanity; mental disorder. Synonyms: craziness, aberration, mania, madness, dementia, derangement. Antonyms: sanity, rationality.
4 days ago · extreme foolishness or mental illness: It would be lunacy to try and climb the mountain in this weather.
/ˈlunəsi/ · noun. foolish or senseless behavior. synonyms: craziness, folly, foolery, indulgence, tomfoolery. see moresee less. types: meshugaas, mishegaas, ...
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If you describe someone's behavior as lunacy, you mean that it seems very strange or foolish. [disapproval].
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Apr 19, 2018 · a behavior pattern characterized by loss of drive and initiative. It is commonly seen in schizophrenia. The pattern is also believed to be ...
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​behaviour that is stupid or crazy synonym madness. It's sheer lunacy driving in such weather. a comedy show full of inspired lunacy.
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2. informal : a person who behaves in a wildly foolish, reckless, or uncontrolled manner. lunatic. 2 of 2.
LUNACY meaning: 1 : extreme foolishness; 2 : something that is very foolish.
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The state of being mad, insanity. a cyclical mental disease, apparently linked to the lunar phases.