Meaning of INSANITY in English

INSANITY

/ ɪnˈsænəti; NAmE / noun [ U ]

1.

the state of being insane

SYN madness :

He was found not guilty, by reason of insanity.

OPP sanity

2.

actions that are very stupid and possibly dangerous

SYN madness , lunacy :

It would be sheer insanity to attempt the trip in such bad weather.

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WORD ORIGIN

late 16th cent.: from Latin insanitas , from insanus , from in- not + sanus healthy.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.