paranoia

A psychotic disorder characterized by delusions of persecution with or without grandeur, often strenuously defended with apparent logic and reason.

Extreme, irrational distrust of others.

A chronic form of insanity characterized by very gradual impairment of the intellect, systematized delusion, and usually by delusions of persecution or mandatory delusions producing homicidal tendency. In its mild form paranoia may consist in the well-marked crotchetiness exhibited in persons commonly called “cranks.” Paranoiacs usually show evidences of bodily and nervous degeneration, and many have hallucinations, esp. of sight and hearing.

Unwarranted suspicion of the motives of others; — used colloquially in a non-technical sense.

A psychotic disorder characterized by delusions of persecution.

Extreme, irrational distrust of others.

a psychological disorder characterized by delusions of persecution or grandeur