n.

1. 【醫】偏執狂；妄想狂
   Psychoanalysts say his case was an extreme paranoia, otherwise he would not have killed people at random.

   心理分析師說他的病例是一種極端的偏執狂，要不然他也不會隨機殺人了。

n.

1. a mental condition characterized by delusions of persecution, unwarranted jealousy, or exaggerated self-importance.
2. unjustified suspicion and mistrust of others.