Insanity ɪnˈsanəti/ noun the state of being seriously mentally ill; madness. "he suffered from bouts of insanity" synonyms: mental illness, mental disorder, mental derangement, madness, insaneness, dementia, dementedness, lunacy, instability, unsoundness of mind, loss of reason; Each day the one and only Dick Grayson deals with insanity. Can Bruce save him, or is it much to late?All Rights Reserved