(n.) Mental derangement; insanity.

alternating personality brain disease catatonia catatonic schizophrenia crack-up dementia praecox depersonalization disconnection dissociation dissociation of personality double personality dual personality emotional disorder emotional dissociation emotional instability functional nervous disorder hebephrenia hebephrenic schizophrenia insanity maladjustment manic-depressive psychosis melancholia mental disorder mental dissociation mental illness multiple personality nervous breakdown nervous disorder neurosis paranoid personality paranoid psychosis paraphrenia personality disorder personality disorganization problems in living psychosis reaction schizoid personality schizoidism schizophrenia schizothymia social maladjustment split personality