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Jyutping si1 ji5
Pinyin sī yì

Definitions (CC-CEDICT)
  1. to imagine
  2. to comprehend
Definitions (Wiktionary)
  1. verb
    to imagine and comprehend
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.