Neutral:
* Resolute: Determined and unwavering.
* Tenacious: Holding firmly to a belief or purpose.
* Unwavering: Not changing or hesitating; steady.
* Persistent: Continuing firmly or obstinately in a course of action.
* Steadfast: Remaining loyal and committed.
Negative:
* Stubborn: Unwilling to change one's opinion or course of action.
* Dogmatic: Asserting opinions or beliefs as if they were absolutely true.
* Inflexible: Unwilling to change or compromise.
* Intransigent: Refusing to compromise or agree.
* Close-minded: Unwilling to consider new ideas or opinions.
* Obstinate: Very unwilling to change one's mind or behavior.
Positive:
* Principled: Based on strong moral principles.
* Conviction: A firmly held belief.
* Determined: Having a strong resolve.
* Uncompromising: Not willing to make concessions.
The best word to use will depend on the specific context and the tone you want to convey.