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Jyutping bat1 ho2 si1 ji6
Pinyin bù kě sī yì

Definitions (粵典–words.hk)
  1. 語句
    神奇​到​想像​唔​到
    inconceivable; incomprehensible; unimaginable
    • 佢昏迷咗二十年都可以醒返,真係不可思議。
      佢昏迷咗二十年都可以醒返,真系不可思议。
      keoi5 fan1 mai4 zo2 ji6 sap6 nin4 dou1 ho2 ji5 seng2 faan1, zan1 hai6 bat1 ho2 si1 ji5.
      He could wake up from a coma of twenty years, it's really inconceivable.

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Jyutping bat1 ho2 si1 ji5
Pinyin bù kě sī yì

Definitions (CC-CEDICT)
  1. inconceivable (idiom); unimaginable
  2. unfathomable
Definitions (CC-CANTO)
  1. unbelievable; mysterious
Definitions (粵典–words.hk)
  1. 語句
    神奇​到​想像​唔​到
    inconceivable; incomprehensible; unimaginable
    • 佢昏迷咗二十年都可以醒返,真係不可思議。
      佢昏迷咗二十年都可以醒返,真系不可思议。
      keoi5 fan1 mai4 zo2 ji6 sap6 nin4 dou1 ho2 ji5 seng2 faan1, zan1 hai6 bat1 ho2 si1 ji5.
      He could wake up from a coma of twenty years, it's really inconceivable.
Definitions (Wiktionary)
  1. adj
    inconceivable; unimaginable; incomprehensible
  2. adj
    incomprehensible by the human mind
  3. noun, obsolete
    The number 10⁶⁴
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Definitions (HSK3.0)
  1. HSK3 七一九级词汇表 #282
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    你真是不可思议。
    你真是不可思議。
    nǐ zhēn shi bù kě sī yì 。
    • You are fantastic.
Examples (粵典–words.hk)
  1. Cantonese
    佢昏迷咗二十年都可以醒返,真系不可思议。
    佢昏迷咗二十年都可以醒返,真係不可思議。
    keoi5 fan1 mai4 zo2 ji6 sap6 nin4 dou1 ho2 ji5 seng2 faan1, zan1 hai6 bat1 ho2 si1 ji5.
    • He could wake up from a coma of twenty years, it's really inconceivable.