de·men·tia

– noun
1. severe impairment or loss of intellectual capacity and personality integration, due to the loss of or damage to neurons in the brain.

de·men·tia prae·cox

- noun
1. any of several psychotic disorders characterized by distortions of reality and disturbances of thought and language and withdrawal from social contact; schizophrenia.

psy·cho·sis

– noun
1. a mental disorder characterized by symptoms, such as delusions or hallucinations, that indicate impaired contact with reality.
2. any severe form of mental disorder, as schizophrenia or paranoia.

neu·ro·sis

– noun
1. a functional disorder in which feelings of anxiety, obsessional thoughts, compulsive acts, and physical complaints without objective evidence of disease, in various degrees and patterns, dominate the personality.
2. a personality disorder typified by excessive anxiety or indecision and a degree of social or interpersonal maladjustment.

schiz·o·phre·ni·a

– noun
1. a severe mental disorder characterized by some, but not necessarily all, of the following features: emotional blunting, intellectual deterioration, social isolation, disorganized speech and behavior, delusions, and hallucinations.
2. a state characterized by the coexistence of contradictory or incompatible elements.

par·a·noi·a

– noun
1. a mental disorder characterized by systematized delusions and the projection of personal conflicts, which are ascribed to the supposed hostility of others, sometimes progressing to disturbances of consciousness and aggressive acts believed to be performed in self-defense or as a mission.
2. baseless or excessive suspicion of the motives of others; extreme, irrational distrust of others.

lu·na·tic

– noun
1. an insane person.
2. a person whose actions and manner are marked by extreme eccentricity or recklessness.
3. a person legally declared to be of unsound mind and who therefore is not held capable or responsible before the law.
– adj.
4. insane; demented; crazy.
5. characteristic or suggestive of lunacy; wildly or recklessly foolish.
6. designated for or used by the insane.
7. mad, frivolous, eccentric, etc.