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Jyutping naan4 gwaai3 bat1 dak1
Pinyin nán guài bù dé

Definitions (Wiktionary)
  1. adv, Sichuanese
    no wonder; small wonder
    (syn.) 怪不得, 唔怪得之, 唔怪之得, 難怪, 怨不得, 怪唔得之, 怪唔之得, 唔怪得, 莫怪, 怪唔得, 难怪