Untractable, wilful, and stubborn, incorrigible by my judgments, ungovernable by mine or by any laws. A metaphor from those beasts that will not bend their necks to receive the yoke or bridle.
Related Commentaries of Exodus 32:9
Exodus 32:9
9 And the LORD said unto Moses, I have seen this people, and, behold, it is a stiffnecked people: