in?san?i?ty
/inˈsanədē/Submit
noun
noun: insanity
the state of being seriously mentally ill; madness.
Example- repeating ones actions expecting different results.
"he suffered from bouts of insanity"
synonyms: mental illness, madness, dementia; More
extreme foolishness or irrationality.
plural noun: insanities
"it might be pure insanity to take this loan"
synonyms: folly, foolishness, madness, idiocy, stupidity, lunacy, silliness; informalcraziness
"it would be insanity to take this loan"
Origin
late 16th century: from Latin insanitas, from insanus (see insane).