YOU SAID:

ain't that a nail in the head

INTO JAPANESE

それは頭の中の釘ではありません

BACK INTO ENGLISH

It's not a nail in the head

INTO JAPANESE

頭の中の釘ではありません

BACK INTO ENGLISH

Not a nail in my head

INTO JAPANESE

私の頭の中の釘ではありません

BACK INTO ENGLISH

Not a nail in my head