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Jyutping mat6 si6
Pinyin wù shì

Definitions (Wiktionary)
  1. verb, Wu
    to not be
    (syn.) 否是, 無是, 不是, 伓是, 𱍤, 唔𱍤, 唔係, 勿是, 非, 毋係, 毋是, 唔是, 否, 無係