'Folly' in the Bible

For you will be ashamed [of the degradation] of the oaks in which you took [idolatrous] pleasure,And you will be ashamed of the gardens [of passion] which you have chosen [for pagan worship].

Therefore the Lord shall have no joy in their young men, neither shall have mercy on their fatherless and widows: for every one is an hypocrite and an evildoer, and every mouth speaketh folly. For all this his anger is not turned away, but his hand is stretched out still.

For a fool speaketh folly, And his heart doth iniquity, to do profanity, And to speak concerning Jehovah error, To empty the soul of the hungry, Yea, drink of the thirsty he causeth to lack.

Do you [who worship idols] not know? Have you not heard?Has it not been told to you from the beginning?Have you not understood from the foundations of the earth [the omnipotence of God and the stupidity of bowing to idols]?