How can I say ''Lost soul'' in jp?
Can I say Tamashi no Nuketa or something else?

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Lost soul = a person who does not seem to know what to do = 途方(とほう)に 暮(く)れた人(ひと)
Rather hard to explain, just remember please.....

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失われた魂

うしなわれたたましい

This is my take on it.

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Maybe something like 迷った魂 but that is quite literal. I don't know how to translate it naturally. I think a lost soul means eternally wandering, right?