無所用心 (mou4 so2 jung6 sam1) — not give serious thought to anything in Cantonese
mouˎ₄無soˊ²所jungˍ₆用samˉ¹心简 无所用心
Mandarin Pinyin: wu2 suo3 yong4 xin1
Meaning of 無所用心
nounnot give serious thought to anything
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