疑心 ぎしん暗鬼 あんき
gishin'anki

Expression

1. suspicion will raise bogies; once you suspect something, everything else will look suspicious; jumping at shadows

Abbreviation
Yojijukugo
Related to 疑心暗鬼を生ず
かれは、だまされてばかりいて、疑心 ぎしん暗鬼 あんきになっている。
karewa damasaretebakari ite gishin'ankini natte iru.
He has a lot of fear and doubt because people are always fooling him.