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Jyutping sam1 daai6 sam1 sai3
Pinyin xīn dà xīn xì

Definitions (CC-CANTO)
  1. (adjective) hesitant to make a decision; shilly-shally; to be of two minds; to be in two minds
Definitions (粵典–words.hk)
  1. 形容詞
    揸​唔​定​主意
    indecisive; undecided; vacillating; literally: heart big heart small
    • 佢心大心細唔知揀乜嘢好。
      佢心大心细唔知拣乜嘢好。
      keoi5 sam1 daai6 sam1 sai3 m4 zi1 gaan2 mat1 je5 hou2.
      He's so indecisive on what to choose.
  2. 近義詞
    十五十六
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    to be hesitant or indecisive
Definitions (Kaifangcidian)
  1. 猶豫 – 犹豫
  2. 拿不定主意
  3. 猶豫不決 – 犹豫不决
  4. 不知如何是好
  5. 不知道該怎樣做 – 不知道该怎样做
Examples (粵典–words.hk)
  1. Cantonese
    佢心大心细唔知拣乜嘢好。
    佢心大心細唔知揀乜嘢好。
    keoi5 sam1 daai6 sam1 sai3 m4 zi1 gaan2 mat1 je5 hou2.
    • He's so indecisive on what to choose.