insanity
[in-san-i-tee]
noun, plural insanities.
1. the condition of being insane; a derangement of the mind.
Synonyms: dementia, lunacy, madness, craziness, mania, aberration.
2. Law. such unsoundness of mind as frees one from legal responsibility, as for committing a crime, or as signals one's lack of legal capacity, as for entering into a contractual agreement.
3. Psychiatry. (formerly) psychosis.
4. extreme foolishness; folly; senselessness; foolhardiness:
"Trying to drive through that traffic would be pure insanity."
a foolish or senseless action, policy, statement, etc.:
"We've heard decades of insanities in our political discourse."