stubborness 

Maintain a mindset, course of actions, resistance and opinion based purely on personal convinctions or personal belief it's true or correct. Most people accomplish great things based on stubborness.

My life, every day, I am driven by stubborness. - Audrey Lajoie

stubborness by BeeMee00 July 19, 2011

stubbornnest 

this is the embodiment of stubbornness, instead of being the most stubborn person, they are the stubbornnest person.

"Quinn Ortiz you are the stubbornnest person i know, not even the most stubborn, you are the stubbornnest"

stubbornnest by Jeffery Sugar December 22, 2023

stubbornestest 

An emphasise on the adjective stubbornest to over power the other adjective.

John: “I’m the stubbornest person here.”
Alfie: “I’m the stubbornestest person here.”
John: “fuck not a lot I can say to that.”

stubbornestest by BXER4567 June 25, 2019