absolutist

This term carries a heavy connotation of rigidity and uncompromising conviction. It is frequently employed in political science to describe systems of total power, but it also applies to moral or philosophical frameworks where rules are viewed as universal and immutable, leaving no room for situational ethics or negotiation.

In a social or interpersonal context, calling someone an absolutist often implies a critique of their perceived inflexibility. It suggests a binary worldview where things are either entirely right or entirely wrong, contrasting sharply with relativism or pragmatism.