Nonyielding
Nonyielding is an adjective used to describe something that does not give way or bend under pressure. It conveys a sense of firmness, resilience, or stubbornness. The term can be applied to physical objects, abstract concepts, or even the behavior of individuals.
In a physical context, nonyielding might describe a sturdy wall that resists impact or a rigid material
The term can also describe a person's character, implying an unyielding determination or an inflexible attitude.