(n.) A kind of mental unsoundness characterized by extreme depression of spirits, ill-grounded fears, delusions, and brooding over one particular subject or train of ideas.

abstraction abulia aching heart agony agony of mind alienation anguish anxiety anxiety equivalent anxiety state apathy bale bitterness bleeding heart brain disease broken heart catatonic stupor compulsion crack-up crushing cyclothymia dejection depression depth of misery desolation despair detachment elation emotional disorder emotional instability emotionalism euphoria extremity flatuous melancholia folie du doute functional nervous disorder gentle melancholy grief heartache heavy heart hypochondria hysteria hysterics indifference infelicity insanity insensibility involutional psychosis lethargy maladjustment mania manic-depressive psychosis melancholia attonita melancholia religiosa melancholiness melancholy mental disorder mental distress mental illness misery nervous breakdown nervous disorder neurosis obsession paranoia pathological indecisiveness pensiveness personality disorder preoccupation problems in living prostration psychalgia psychomotor disturbance psychosis reaction romantic melancholy sadness schizophrenia social maladjustment stupor stuporous melancholia suicidal despair tic tristfulness twitching unresponsiveness wistfulness withdrawal woe wretchedness