noun (plural -cies) Etymology: lunatic Date: 1541 1. insanity , intermittent insanity once believed to be related to phases of the moon, wild foolishness ; extravagant folly, a foolish act
LUNACY
Meaning of LUNACY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012