What term describes someone inclined to go against what is expected and appears stubborn?

The term that best describes someone inclined to go against what is expected and appears stubborn is "perverse." This word embodies a sense of willfulness or determination to do the opposite of what is considered appropriate or reasonable, often due to a rebellious or contrarian attitude. A perverse individual might intentionally choose actions that defy norms or expectations, showcasing a strong resistance to conformity.

In contrast, stalwart refers to someone who is loyal and steadfast, often in support of a cause, and does not inherently imply a rebellion against expectations. Opportune describes a favorable or advantageous moment but does not connect to notions of stubbornness or contrariness. Tolerant indicates an openness or acceptance of differing views or behavior rather than an inclination to resist or oppose them. Therefore, the choice of "perverse" accurately captures the essence of someone who goes against expectations with a stubborn attitude.