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Jyutping mou5 ding6 sing3
Pinyin mǎo dìng xìng

Definitions (CC-CANTO)
  1. to refer somebody cannot settle down, or pay attention to things
Definitions (粵典–words.hk)
  1. 語句
    指​小朋友​好動​貪玩​,​學習​、​做事​唔​專心
    referring to children who are active and playful, and do not concentrate on learning or serious work
    • 細路仔冇定性,叫佢做我都唔放心。
      细路仔冇定性,叫佢做我都唔放心。
      Children are playful and unable to concentrate on things, so I will be worried if you pass a task to them.
Definitions (Kaifangcidian)
  1. 淘氣 – 淘气
  2. 貪玩 – 贪玩
  3. 好動 – 好动
  4. 心野
  5. 不專心 – 不专心
  6. 沒耐性 – 没耐性
  7. 不踏實 – 不踏实
Examples (粵典–words.hk)
  1. Cantonese
    细路仔冇定性,叫佢做我都唔放心。
    細路仔冇定性,叫佢做我都唔放心。
    • Children are playful and unable to concentrate on things, so I will be worried if you pass a task to them.