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Jyutping fei2 ji4 so2 si1
Pinyin fěi yí suǒ sī

Definitions (CC-CEDICT)
  1. unimaginable
  2. outrageous
  3. freakish
Definitions (粵典–words.hk)
  1. 形容詞
    好難​想像得到
    unimaginable; strange
    • 犯人用強酸溶屍呢個毁屍滅跡嘅方法真係匪夷所思。
      犯人用强酸溶尸呢个毁尸灭迹嘅方法真系匪夷所思。
      faan6 jan4 jung6 koeng4 syun1 jung4 si1 ni1 go3 wai2 si1 mit6 zik1 ge3 fong1 faat3 zan1 hai6 fei2 ji4 so2 si1.
      It is hard to imagine that the murderer used strong acid to melt the body and destroy all the traces.
Definitions (Wiktionary)
  1. phrase, idiomatic
    not what an ordinary person can imagine; unimaginable; unusual; fantastic
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    犯人用强酸溶尸呢个毁尸灭迹嘅方法真系匪夷所思。
    犯人用強酸溶屍呢個毁屍滅跡嘅方法真係匪夷所思。
    faan6 jan4 jung6 koeng4 syun1 jung4 si1 ni1 go3 wai2 si1 mit6 zik1 ge3 fong1 faat3 zan1 hai6 fei2 ji4 so2 si1.
    • It is hard to imagine that the murderer used strong acid to melt the body and destroy all the traces.
Examples (Wiktionary)
  1. Mandarin
    匪夷所思
    匪夷所思
    fěi yí suǒ sī
    • not what an ordinary person can imagine; unusual; fantastic