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Jyutping saam1 sam1 ji6 ji3
Pinyin sān xī nè r5 yì

Definitions (Wiktionary)
  1. phrase, idiomatic
    shilly-shally; half-hearted; without consistency or constancy; likely to change minds easily
    (syn.) 意馬心猿, 心猿意马, 心猿意馬, 心神不定, 意马心猿

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Jyutping saam1 sam1 ji6 ji3
Pinyin sān xīn èr yì

Definitions (CC-CEDICT)
  1. in two minds about sth (idiom)
  2. half-hearted
  3. shilly-shallying
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    在实战中,你要知道三心二意是很危险的。
    在實戰中,你要知道三心二意是很危險的。
    zài shí zhàn zhōng , nǐ yào zhī dào sān xīn èr yì shì hěn wēi xiǎn de 。
    • In real combat, you must not forget that hesitation is a very dangerous thing.