In-săn'i-ty, n.

n. [Lat. insanitas, Fr. insanité.] The state of being insane; unsoundness of mind; derangement of intellect; madness.

Synonyms— INSANITY, LUNACY, MADNESS, DERANGEMENT, ALIENATION, ABERRATION, MANIA, DELIRIUM, FRENZY, MONOMANIA, DEMENTIA. Insanity is the generic term for all such diseases; lunacy has now an equal extent of meaning, though once used to denote periodical insanity; madness has the same extent, though originally referring to the rage created by the disease; derangement, aberration, alienation, are popular terms for insanity; delirium, mania, and frenzy denote excited states of the disease; dementia denotes the loss of mental power by this means; monomania is insanity upon a single subject.