'Foolish' in the Bible

From which some have been turned away, giving themselves to foolish talking;

But have nothing to do with unclean and foolish stories. Give yourself training in religion:

But those who have a desire for wealth are falling into danger, and are taken as in a net by a number of foolish and damaging desires, through which men are overtaken by death and destruction.

O Timothy, take good care of that which is given to you, turning away from the wrong and foolish talk and arguments of that knowledge which is falsely so named;