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Jyutping mou4 daan3
Pinyin wú dàn

Definitions (Wiktionary)
  1. adj, Min-Nan
    correct; right
    (syn.) 不錯, 不错
  2. intj, Min-Nan
    correct; right; that's correct
    (syn.) 冇錯, 沒錯, 冇错, 没错