Lunacies - Definitions from Dictionary.com

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lu·na·cy

Audio Help [loo-nuh-see] Pronunciation Key

–noun, plural -cies.

1.	insanity; mental disorder.

2.	intermittent insanity, formerly believed to be related to phases of the moon.

3.	extreme foolishness or an instance of it: Her decision to resign was sheer lunacy.

4.	Law. unsoundness of mind sufficient to incapacitate one for civil transactions.

[Origin: 1535–45; lun(atic) + -acy

]

—Synonyms 1. derangement, dementia; craziness, madness, mania, aberration. 3. folly, stupidity.

—Antonyms 1, 2. rationality, sanity.

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
Lunacies

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lu·na·cy Audio Help (lōō'nə-sē) Pronunciation Key
n. pl. lu·na·cies

Insanity, especially insanity relieved intermittently by periods of clear-mindedness. See Synonyms at insanity.
1. Great or wild foolishness.
2. A wildly foolish act.
Archaic Intermittent mental derangement associated with the changing phases of the moon.