In philosophy, the thing-in-itself is considered an absolute existence that we cannot recognize.

His way of thinking is very philosophical.

What is this thing?

We are planning to attend the meeting tomorrow.

His absolute belief gave him the power to overcome difficulties.

There is no reason to doubt his existence.

That character exists in real life, not in anime.

He was taking it easy from the start of the game itself.

The problem itself is not difficult.

He is majoring in philosophy.