YOU SAID:

people who overthink have nothing to think of but thoughts

INTO JAPANESE

考えすぎる人は思考以外何も考えない

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People who think too much think nothing but thoughts

INTO JAPANESE

考えすぎる人は思考しか考えていない

BACK INTO ENGLISH

People who think too much think only about thoughts

INTO JAPANESE

考えすぎる人は思考のことだけを考えます

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People who think too much only think about thoughts

INTO JAPANESE

考えすぎる人は思考のことだけを考えます

BACK INTO ENGLISH

People who think too much only think about thoughts