YOU SAID:

He became numb to everything that used to hurt him.

INTO JAPANESE

彼はかつて彼を傷つけていたすべてのものに無感覚になった。

BACK INTO ENGLISH

He became insensitive to everything that once hurt him.

INTO JAPANESE

彼はかつて彼を傷つけたすべてに鈍感になった。

BACK INTO ENGLISH

He became insensitive to everything that once hurt him.