Choose the most appropriate synonym of the given word. Obstinate

The word 'Obstinate' describes a person who is stubborn, unyielding, and determined to stick to their own opinions or course of action regardless of reason. Among the given options, 'Headstrong' is the most appropriate synonym because it similarly refers to someone who is willful and insists on having their own way, often disregarding advice or consequences. Both words convey a sense of inflexibility and stubbornness in behavior. In contrast, 'Devilish' relates to something mischievous or evil, which does not capture the meaning of stubbornness. 'Joyful' means happy and cheerful, which is unrelated to being obstinate. Similarly, 'Agreeable' describes someone who is pleasant and willing to agree with others, which is actually an antonym of obstinate. Therefore, Option A (Headstrong) is the correct choice as it shares the core meaning of being stubborn and unyielding.