1) refusing to give in (adamant)

2) showing no fear about refusing to obey; openly disobedient (defiant)

3) (an instance of) denying; refusing a request (denial)

4) difficult to control; refusing advice (headstrong)

5) that cannot be moved; not able, refusing to be affected or changed (immovable)

6) that cannot be bent; refusing to change or be influenced (inflexible)

7) refusing to change one's opinion, especially about an important issue (intransigent)

8) (an act of) denying, refusing (negation)

9) refusing to obey (especially after being punished) (recalcitrant)

10) (an instance of) an act of refusing (refusal)