1. (n.) The state of being insane; unsoundness or derangement of mind; madness; lunacy.

2. (n.) 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.

aberration absurdity alienation amentia arrested development asininity backwardness battiness blithering idiocy brain disease brainlessness buffoonery clownishness crack-up crackpottedness crankiness craziness cretinism daffiness delirium delusion dementia praecox derangement desipience distraction dotage dottiness eccentricity emotional disorder emotional instability fatuity fatuousness folly foolery foolheadedness foolishness frenzy frivolity frivolousness functional nervous disorder giddiness goofiness half-wittedness hallucination hysteria idiocy idiotism illusion imbecility impracticality inanity ineptitude infantilism insaneness irrationality irresponsibility lunacy madness maladjustment mania manic-depressive psychosis melancholia mental defectiveness mental deficiency mental derangement mental disorder mental handicap mental illness mental retardation mindlessness mongolianism mongolism mongoloid idiocy moronism moronity nervous breakdown nervous disorder neurosis niaiserie nonsense nugacity nuttiness paranoia personality disorder preposterousness problems in living profound idiocy psychoneurosis psychopathy psychosis queerness reaction retardation retardment sappiness schizophrenia screwiness senselessness silliness simple-wittedness simplemindedness simpleness simplicity social maladjustment stupidity subnormality thoughtlessness triflingness triviality unbalance unreasonableness wackiness weirdness witlessness zaniness zanyism