If you say that someone suffers from paranoia, you think that they are too suspicious and afraid of other people.
例句
The mood is one of paranoia and expectation of war.那是一种对战争既畏惧又期待的心理。...the mounting paranoia with which he viewed the world around him.他看待周围世界时越来越重的疑惧心理
N-UNCOUNT
偏执狂；妄想症
In psychology, if someone suffers from paranoia, they wrongly believe that other people are trying to harm them, or believe themselves to be much more important than they really are.
英汉词典释义
n.
<医>妄想狂,偏执狂
Her passion for cleanliness borders on paranoia.她的洁癖近乎偏执。
英英词典释义
Noun
1. a psychological disorder characterized by delusions of persecution or grandeur