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Jyutping mou4 cing4 mou5 si6
Pinyin wú qíng mǎo shì

Definitions (Wiktionary)
  1. phrase, Xiang, idiomatic
    to have nothing to do
    (syn.) 無所事事, 无所事事
  2. phrase, Xiang, idiomatic
    without cause or reason; for no reason at all
    (syn.) 无因致端, 無緣無故, 無啦啦, 无事无白, 無因端, 無事無白, 无代无志, 无底无代, 無因致端, 无因端, 無底無代, 無代無誌, 无啦啦, 无缘无故