His paranoia made him suspect that everyone was plotting against him.

paranoia 源自希腊语，由 para-（表示"异常"）和 nous（意为"心智"）组成，指"偏执妄想"的心理状态。这个词特指一种病态的多疑，患者会毫无根据地认为他人对自己怀有恶意。