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Jyutping soeng2 dong1 jin4
Pinyin xiǎng dāng rán

Definitions (CC-CEDICT)
  1. to take sth as given
  2. to make assumptions
Definitions (粵典–words.hk)
  1. 副詞
    從主觀​理論​上​覺得​一定​係​噉​(​通常​帶​貶義​)
    intuition; that which is expected in a subjective manner
    • 辯論嘅嘢,與其想當然,倒不如訴諸實證啦!
      辩论嘅嘢,与其想当然,倒不如诉诸实证啦!
      bin6 leon6 ge3 je5, jyu5 kei4 soeng2 dong1 jin4, dou2 bat1 jyu5 sou3 zyu1 sat6 zing3 laa1!
      Instead of relying on intuition, why don't you back your arguments with hard evidence?
Definitions (Wiktionary)
  1. verb
    to take something for granted
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    辩论嘅嘢,与其想当然,倒不如诉诸实证啦!
    辯論嘅嘢,與其想當然,倒不如訴諸實證啦!
    bin6 leon6 ge3 je5, jyu5 kei4 soeng2 dong1 jin4, dou2 bat1 jyu5 sou3 zyu1 sat6 zing3 laa1!
    • Instead of relying on intuition, why don't you back your arguments with hard evidence?