Webster
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Webster’s Revised Unabridged Dictionary · 1913

Insanity

In·san′i·ty (ĭn·săn′ĭ·ty̆), n. [L. insanitas unsoundness; cf. insania insanity, F. insanite.] 1. The state of being insane; unsoundness or derangement of mind; madness; lunacy.

All power of fancy over reason is a degree of insanity. Johnson.

Without grace The heart's insanity admits no cure. Cowper.

2. (Law) Such a mental condition, as, either from the existence of delusions, or from incapacity to distinguish between right and wrong, with regard to any matter under action, does away with individual responsibility.

Syn. — 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, 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.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.