PARANOIA

paranoia

(noun) a psychological disorder characterized by delusions of persecution or grandeur

Source: WordNet® 3.1

Etymology

Noun

paranoia (countable and uncountable, plural paranoias)

A psychotic disorder characterized by delusions of persecution, conspiracy and perceived threat against the person, often associated with false accusations and general mistrust of others

Antonym: pronoia

Extreme, irrational distrust of others.

Source: Wiktionary

Par`a*noi"a, n. Etym: [NL., fr. Gr. (Med.)

Definition: Mental derangement; insanity.

Source: Webster’s Unabridged Dictionary 1913 Edition