plural insanities
1
: severe mental illness : the condition of being insane
She was found not guilty by reason of insanity.
temporary insanity
2
: something that is very foolish or unreasonable
His friends thought his decision to quit his job was pure insanity.
Please, no more violence. It's time to stop this insanity.
the insanities of modern life
Cite this Entry
“Insanity.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/insanity. Accessed 29 Aug. 2026.
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