Insanity, madness, lunacy, and craziness are behaviors caused by certain abnormal mental or behavioral patterns. Insanity can manifest as violations of societal norms, including a person …

An oft-quoted bon mot (frequently attributed to Albert Einstein, Benjamin Franklin, or a number of other people who probably never said it) is that insanity may be defined as “doing the same …

INSANITY definition: (not in technical use as a medical diagnosis) the condition of being insane; a derangement of the mind. See examples of insanity used in a sentence.

The condition of being insane; a state of mind that impedes the ability to think, reason, or behave in ways that are considered normal, esp. one caused by mental illness. Also in extended use.

INSANITY definition: 1. a very stupid, unreasonable, or dangerous action or situation: 2. the condition of being very…. Learn more.

Definition of insanity noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

a form of insanity or dementia praecox that can appear at puberty, characterized by foolish behavior and deterioration of the mental faculties.