'Foolish' in the Bible

Those trusting on their wealth, And in the multitude of their riches, Do shew themselves foolish.

For he seeth wise men die, Together the foolish and brutish perish, And have left to others their wealth.

Remember this -- an enemy reproached Jehovah, And a foolish people have despised Thy name.

Consider, ye brutish among the people, And ye foolish, when do ye act wisely?