'Foolish' in the Bible

Thus saith the Lord GOD; Woe unto the foolish prophets, that follow their own spirit, and have seen nothing!

For this cause you will see no more foolish visions or make false use of secret arts: and I will make my people free from your power; and you will be certain that I am the Lord.

Now when she saw that her hope was made foolish and gone, she took another of her little ones and made him into a young lion.

And her prophets have been using whitewash, seeing foolish visions and making false use of secret arts, saying, This is what the Lord has said, when the Lord has said nothing.

“Now her sister Oholibah saw this, yet she was more corrupt in her lust than she, and her acts of prostitution were more [wanton] than the immoralities of her sister.