'Foolish' in the Bible

Then I said, “[Surely] these are only the poor (uneducated);They are [sinfully] foolish and have no [spiritual] understanding,For they do not know the way of the LordOr the ordinance of their God [and the requirements of His just and righteous law].

‘Now hear this, O foolish people without heart,Who have eyes but do not see,Who have ears but do not hear.

But they are altogether irrational and stupid and foolishIn their discipline of delusion—their idol is [only] wood [it is ridiculous, empty and worthless]!