uncompromising Synonyms

inflexible sturdy stubborn stringent strict stiff-necked stiff stern steadfast single-minded severe set unbendable tenacious unpermissive set in stone pigheaded unwavering unadaptable unchangeable unyielding unshakable unrelenting unbending tough ruthless rigorous immovable headstrong harsh hard grim fixed firm dogged determined adamantine implacable inexorable insistent rigid resolute remorseless relentless pertinacious obstinate obdurate iron intransigent intractable