Lunacy

Noun

 * 1)  The state of being mad, insanity
 * 2) a cyclical mental disease, apparently linked to the lunar phases
 * 3) insanity implying legal irresponsability.
 * 4) Something deeply misguided.

Synonyms

 * insanity

Derived terms

 * lunatic

Thesaurus
aberration, abnormality, absurdity, alienation, asininity, battiness, brain damage, brainlessness, brainsickness, buffoonery, clouded mind, clownishness, crackpottedness, crankiness, craziness, daffiness, daftness, dementedness, dementia, derangement, desipience, disorientation, distraction, eccentricity, fatuity, fatuousness, folie, folly, foolery, foolhardiness, foolheadedness, foolishness, frivolity, frivolousness, furor, giddiness, goofiness, idiocy, illogic, illogicality, imbecility, inanity, ineptitude, insaneness, insanity, irrationality, loss of mind, loss of reason, madness, mania, mental deficiency, mental derangement, mental disease, mental disorder, mental disturbance, mental illness, mental instability, mental sickness, mind overthrown, mindlessness, mindsickness, niaiserie, nugacity, nuttiness, oddness, pixilation, possession, preposterousness, psychopathy, psychosis, queerness, rabidness, reasonlessness, ridiculousness, sappiness, screwiness, senselessness, shattered mind, sick mind, sickness, silliness, strangeness, stupidity, thoughtlessness, triflingness, triviality, unbalance, unbalanced mind, unsaneness, unsound mind, unsoundness, unsoundness of mind, wackiness, weirdness, witlessness, zaniness, zanyism