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insanity

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insanity/ɪnˈsænəti/noun
pluralinsanities
insanity
/ɪnˈsænəti/
noun
pluralinsanities
Learner's definition of INSANITY  
[noncount]  : severe mental illness : the condition of being insane
: something that is very foolish or unreasonable
[noncount]
[count]
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