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Jyutping mou4 doi6 mou4 zi3
Pinyin wú dài wú zhì

Definitions (Wiktionary)
  1. verb, Min-Nan
    to be OK; to be all right; to be out of danger or trouble
    (syn.) 沒事, 没事
  2. adv, Min-Nan
    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, 无底无代, 無情冇事, 无端, 無因致端, 无情冇事, 无因端, 無端, 無底無代, 无啦啦, 无缘无故