Eight-character shadow wall, head bump. What word?

There are four answers. You need to ask four questions and answer four times. The first is pain, the second is dizziness, the third is stupidity, and the fourth is death.

If you hit your head against the wall, it will hurt. Of course, playing again will make you dizzy. Isn't it stupid to hit you after hitting you twice? You always hit your life like this.

Some people say that the first word is tiger. If you hit your head against the wall, you are not a tiger.