"Utter insanity" means complete and extreme madness or craziness.
Sentences with «utter insanity»
What starts out as a relatively unobjectionable film devolves into utter insanity. (chicagoreader.com)
The #InfinityWar teaser was utter insanity with Thor encountering the Guardians, Thanos using the gauntlet, Spider - Man in two suits, & more! (allgeektome.net)
My search has led me into utter INSANITY, I live in the DMV and can't find a reputable breeder. (wtfrenchie.com)