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Jyutping ji4 san4 ji4 gwai2
Pinyin yí shén yí guǐ

Definitions (CC-CEDICT)
  1. to suspect everyone
  2. overly suspicious
Definitions (粵典–words.hk)
  1. 形容詞
    呢​樣​又​懷疑​,​嗰​樣​又​懷​疑​;​形容​人​多疑​,​疑心​重
    extremely suspicious; literally, suspicious of gods and ghosts
    • 佢成日疑神疑鬼,驚死有人落毒害佢。
      佢成日疑神疑鬼,惊死有人落毒害佢。
      keoi5 seng4 jat6 ji4 san4 j4 gwai2, geng1 sei2 jau5 jan4 lok6 duk6 hoi6 keoi5.
      He is very suspicious, especially afraid that someone will poison him.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be extremely suspicious; to be afraid of one's own shadow
    (syn.) 疑神疑魍
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    喜欢的人什么都不怀疑,或什么都疑神疑鬼。
    喜歡的人什麼都不懷疑,或什麼都疑神疑鬼。
    xǐ huan de rén shén me dōu bù huái yí , huò shén me dōu yí shén yí guǐ 。
    • People who love doubt nothing, or doubt everything.
Examples (粵典–words.hk)
  1. Cantonese
    佢成日疑神疑鬼,惊死有人落毒害佢。
    佢成日疑神疑鬼,驚死有人落毒害佢。
    keoi5 seng4 jat6 ji4 san4 j4 gwai2, geng1 sei2 jau5 jan4 lok6 duk6 hoi6 keoi5.
    • He is very suspicious, especially afraid that someone will poison him.