Definitions

1. adjective

having or characterized by a persistent and irrational feeling of distrust or fear of the world around you, especially when it involves delusions of persecution or threat.

“He became paranoid after being the victim of a burglary and started to think that everyone around him was watching him.”

2. noun

a person who has a paranoid personality, especially one who is excessively suspicious and distrustful of others.

“The paranoid in the group started to accuse everyone of conspiring against him.”