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Jyutping laan6 nai4 fu4 bat1 soeng5 coeng4
Pinyin làn ní fú bù shàng qiáng

Definitions (CC-CEDICT)
  1. useless (idiom)
  2. worthless
  3. inept
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be so incompetent that others' help is of no use; to be hopelessly inept
    (syn.) 滥泥糊毋上壁, 烂泥扶唔上壁, 濫泥糊毋上壁, 爛泥扶唔上壁
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    烂泥扶不上墙。
    爛泥扶不上牆。
    làn ní fú bù shàng qiáng 。
    • You can't raise a cat to be a dog.