無心之過 [无－－过]

Jyutping mou4 sam1 zi1 gwo3
Pinyin wú xīn zhī guò

Definitions (Wiktionary)
  1. phrase, idiomatic
    unintentional mistake; careless mistake
    (syn.) 无心之失, 無心之失
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）