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Jyutping mou4 bun3 zing3
Pinyin wú bàn zhèng

Definitions (Wiktionary)
  1. noun, Hokkien
    one who lacks adequate knowledge or skills; dilettante; smatterer; dabbler
  2. adj, Hokkien
    incompetent; incapable; limited (of one's skills, knowledge, etc.)
    (syn.) 半桶师, 無半撇, 无半撇, 半桶师仔, 半桶師仔, 半精戆, 半路师, 半吊子, 半精戇, 𫧃半精, 半桶師, 半桶水, 𣍐半精, 半路師, 半桶屎