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Jyutping mou5 jiu1 gwat1
Pinyin mǎo yāo gǔ

Definitions (CC-CANTO)
  1. (adjective) literally means 'no spine', to describe someone that stands / sits with poor posture or slouches; metaphorically to describe someone that lacks backbone / spineless; to describe something (such as a plan or a strategy) or someone that is unreliable / undependable 1.
Definitions (粵典–words.hk)
  1. 形容詞
    冇​骨氣​、​靠​唔​住
    to have no backbone, has no guts; literally: no waist bone
    • 做人冇腰骨,又點可以做大事呀?
      做人冇腰骨,又点可以做大事呀?
      zou6 jan4 mou5 jiu1 gwat1, jau6 dim2 ho2 ji5 zou6 daai6 si6 aa3?
      Without bravery, how can one achieve high?
Definitions (Kaifangcidian)
  1. 沒骨氣 – 没骨气
  2. 靠不住
  3. 沒原則 – 没原则
  4. 沒信義 – 没信义
Examples (粵典–words.hk)
  1. Cantonese
    你冇腰骨㗎?成日凭住道门企。
    你冇腰骨㗎?成日憑住道門企。
    nei5 mou5 jiu1 gwat1 gaa4 seng4 jat6 bang6 zyu6 dou6 mun4 kei5
    • Do you have no spine? Why are you always leaning against the door?
  2. Cantonese
    佢好似条蛇咁,冇腰骨嘅,成日挨挨凭凭!
    佢好似條蛇咁,冇腰骨嘅,成日挨挨憑憑!
    keoi5 hou2 ci5 tiu4 se4 gam2, mou5 jiu1 gwat1 ge3, seng4 jat6 aai1 aai1 bang6 bang6!
    • He's like a snake. He's got literally no backbone and he's always leaning on one thing or another.
  3. Cantonese
    做人冇腰骨,又点可以做大事呀?
    做人冇腰骨,又點可以做大事呀?
    zou6 jan4 mou5 jiu1 gwat1, jau6 dim2 ho2 ji5 zou6 daai6 si6 aa3?
    • Without bravery, how can one achieve high?
Examples (Wiktionary)
  1. Cantonese
    男人唔可以冇膊头,冇腰骨。
    男人唔可以冇膊头,冇腰骨。
    naam4 jan2 m4 ho2 ji5 mou5 bok3 tau4, mou5 jiu1 gwat1.
    • A man cannot have no sense of responsibility and no spine.