What is a synonym for "obstinate"?

The term "obstinate" refers to someone who is stubbornly refusing to change their opinion or chosen course of action. The synonym "stubborn" captures this essence perfectly, as it denotes a firm determination to maintain one's position or opinion, even in the face of reason or arguments.

In contrast, the other choices present characteristics that are quite the opposite of obstinacy. "Flexible" implies an ability to adapt or change plans easily, indicating a willingness to adjust one's views or actions. "Compliant" refers to a readiness to conform or agree to rules, policies, or demands, which suggests a lack of stubbornness. Lastly, "agreeable" denotes a friendly or cooperative nature that is open to others' suggestions and decisions, reinforcing the idea of being accommodating rather than inflexible. Thus, "stubborn" is the most fitting synonym for "obstinate."