1. having an unreasonable fear or suspicion that other people are trying to harm you
Usage: psychology
2. extremely worried or anxious about something without good reason
Usage: informal

1. a person who suffers from paranoia or has paranoid thoughts
Usage: psychology

Examples

• She became paranoid that her coworkers were talking about her behind her back.
• His paranoid behavior made it difficult for him to maintain friendships.
• I’m getting paranoid about leaving my car unlocked in this neighborhood.
• The paranoid patient believed the nurses were plotting against him.
• Don’t be so paranoid – nobody is following you.
• He’s a paranoid who thinks the government is watching his every move.
• Her paranoid thoughts kept her awake at night.