YOU SAID:
i could care less about this thing
INTO JAPANESE
私はこのことについてはあまり気にしないだろう
BACK INTO ENGLISH
I would not care less about this
INTO JAPANESE
私はこれについてあまり気にしないだろう
BACK INTO ENGLISH
I do not care much about this
INTO JAPANESE
私はこれについてはあまり気にしない
BACK INTO ENGLISH
I do not care much about this
That didn't even make that much sense in English.