paranoid
🇺🇸
/ˈpærənɔɪd/
🇬🇧
/ˈpærənɔɪd/
unreasonably suspicious and fearful of other people's intentions
He became paranoid about his coworkers after the promotion.
suffering from a mental condition characterized by delusions of persecution
The patient exhibited paranoid symptoms, believing everyone was out to get him.
a person who is excessively suspicious and fearful of others
He's such a paranoid that he checks the locks on the doors ten times before going to bed.