不知天高地厚 [－－－－－－]

Jyutping bat1 zi1 tin1 gou1 dei6 hau5
Pinyin bù zhī tiān gāo dì hòu

Definitions (CC-CEDICT)
  1. not to know the immensity of heaven and earth
  2. an exaggerated opinion of one's own abilities
Definitions (粵典–words.hk)
  1. 語句
    狂妄自大​，​唔​知​自己​有​幾​多斤​両
    to have an exaggerated view of one's own abilities; literally: not to know the immensity of heaven and earth
    • 居然挑戰大總統，真係不知天高地厚。
      居然挑战大总统，真系不知天高地厚。
      geoi1 jin2 tiu1 zin3 daai6 zung2 tung2, zan1 hai6 bat1 zi1 tin1 gou1 dei6 hau5
      He audaciously challenges the President with overconfidence in his abilities.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to have an exaggerated opinion of one's abilities; to think one knows everything; to be ignorant
Examples (粵典–words.hk)
  1. Cantonese
    居然挑战大总统，真系不知天高地厚。
    居然挑戰大總統，真係不知天高地厚。
    geoi1 jin2 tiu1 zin3 daai6 zung2 tung2, zan1 hai6 bat1 zi1 tin1 gou1 dei6 hau5
    • He audaciously challenges the President with overconfidence in his abilities.