stubborn, headstrong, pigheaded, intransigent, unyielding, inflexible, mulish, willful, recalcitrant, persistent
inflexible - resolute - adamant - unwavering - stubborn - obstinate - firm - steadfast - relentless - implacable
Unyielding describes someone or something that does not give way, either physically or mentally. A person with an unyielding attitude refuses to change their opinion, decision, or behavior, even under pressure, criticism, or difficulty. It can refer to strong determination and firmness, but also to inflexibility or stubbornness when compromise might be helpful. In a physical sense, it can describe a surface or material that is hard, rigid, and difficult to bend or break. The term often carries a sense of strength and resilience, but may also imply a lack of adaptability.