Obstinacy

Etymology

From Latin "obstinare" (to persist, be resolved), built on "ob-" (against) and a root related to "stare" (to stand). At its core is standing firm — against argument, against evidence, against advice.

noun · /OB-sti-nuh-see/
Stubborn refusal to change one’s course or opinion despite good reasons to.
What it names
Names persistence turned into a fault — holding firm not from principle but from unwillingness to yield.
Example
His obstinacy about the original plan cost them months after everyone else saw it wouldn’t work.
Related idea
Stubbornness is the everyday word for the same trait; tenacity is its admiring cousin, praising the same firmness when it serves a worthy end. The difference is often only whether we think the person is right.