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Jyutping mong5 wai4
Pinyin wàng wéi

Definitions (CC-CEDICT)
  1. to take rash action
Definitions (Wiktionary)
  1. verb
    to act recklessly; to act wilfully
Examples (粵典–words.hk)
  1. Cantonese
    大胆妄为
    大膽妄為
    • audacious
  2. Cantonese
    任意妄为
    任意妄為
    • tyrannical
  3. Cantonese
    恣意妄为
    恣意妄為
    zi3 ji3 mong5 wai4
    • Wayward
  4. Cantonese
    你系大人嚟喇,唔可以再任意妄为㗎喇。
    你係大人嚟喇,唔可以再任意妄為㗎喇。
    nei5 hai6 daai6 jan4 lei4 laa3, m4 ho2 ji5 zoi3 jam6 ji3 mong5 wai4 gaa3 laa3.
    • You are already an adult. You can't act arbitrarily and recklessly anymore.
Examples (Wiktionary)
  1. Mandarin
    难道你真的大胆妄为,连圣旨都不顾了吗。
    難道你真的大膽妄為,連聖旨都不顧了嗎。
    nán dào nǐ zhēn de dà dǎn wàng wèi , lián shèng zhǐ dōu bù gù le ma .
    • Don't tell me that you really dare take action arbitrarily without even caring about the royal decree at all, do you?