'Foolish' in the Bible

For there are men who are not ruled by law; foolish talkers, false teachers, specially those of the circumcision,

For we ourselves also were sometimes foolish, disobedient, deceived, serving divers lusts and pleasures, living in malice and envy, hateful, and hating one another.

But avoid foolish questions, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain.