1. (n.) Intermittent mental unsoundness; insanity which is broken by intervals of reason\, -- formerly supposed to be influenced by the changes of the moon; any form of unsoundness of mind, except idiocy; mental derangement or alienation.

2. (n.) A morbid suspension of good sense or judgment, as through fanaticism.

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