'Foolish' in the Bible

Where is the wise man? Where is the expert in the Mosaic law? Where is the debater of this age? Has God not made the wisdom of the world foolish?

But God chose what the world thinks foolish to shame the wise, and God chose what the world thinks weak to shame the strong.

Guard against self-deception, each of you. If someone among you thinks he is wise in this age, let him become foolish so that he can become wise.