Home › Words › I › insanenessinsanenessinsaneness · noun — insanity; madness.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom insane + -ness.nouninsanity; madnessDefinitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.disensanity 77% match — insanity; folly vs insaneness →insanity 72% match — The state of being insane; madness. vs insaneness →insanely 71% match — In an insane manner; not sanely. vs insaneness →insanability 69% match — The state of being insanable, or impossible to cure. vs insaneness →craziness 69% match — The state of being crazy; madness; derangement vs insaneness →insano 68% match — An insane person. vs insaneness →nonsanity 67% match — A lack of sanity; the condition of not being sane; as:; Synonym of insanity. vs insaneness →asininity 67% match — The quality of being asinine; obstinate stupidity vs insaneness →