pronoun
Reflexive pronoun used for emphasis or to refer back to a previously mentioned inanimate or animate entity. Often contrasts with other entities or highlights the thing in question.
See also: 彼女自身 (かのじょじしん)
問題はそれ自身が難しいのではなく、時間が足りないのだ。
The problem is not difficult in itself; it's that there isn't enough time.
彼はそれ自身を責めるようなことはしなかった。
He didn't blame himself for that.
Compound of それ (that) and 自身 (self). The form follows the pattern of personal pronoun + 自身 to create a reflexive pronoun.