'Foolish' in the Bible

For my people are foolish, me they have not known, Foolish sons are they, yea, they are not intelligent, Wise are they to do evil, And to do good they have not known.

And I -- I said, 'Surely these are poor, They have been foolish, For they have not known the way of Jehovah, The judgment of their God.

Hear ye, I pray you, this, O people, foolish and without heart, Eyes they have, and they see not, Ears they have, and they hear not.

And in one they are brutish and foolish, An instruction of vanities is the tree itself.

And they have drunk, and shaken themselves and shewn themselves foolish, because of the sword that I am sending among them.

A sword is on the princes, And they have become foolish; A sword is on her mighty ones, And they have been broken down;