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Jyutping mou4 so2 zok3 wai4
Pinyin wú suǒ zuò wéi

Definitions (CC-CEDICT)
  1. attempting nothing and accomplishing nothing (idiom); without any initiative or drive
  2. feckless
Definitions (Wiktionary)
  1. phrase, idiomatic
    to attempt nothing and accomplish nothing; to be in a state of inertia
Definitions (HSK3.0)
  1. HSK3 七一九级词汇表 #4381