paranoid is an adjective describing someone who has extreme and unreasonable feelings that other people do not like them or are going to harm or criticize them.
In psychology, paranoid refers to a mental condition characterized by delusions of persecution, unwarranted jealousy, or exaggerated self-importance.
The term "paranoid" also appears in:
1. Everyday language - "Don't be so paranoid!"
2. Pop culture - "Paranoid" by Black Sabbath
3. Technology - "paranoid mode" in security systems