(a.) Refusing compromise; uncompromising; irreconcilable\.

adamant adamantine ass bigot bitter-ender brawler bullethead cast-iron defendant diehard disputant dissentient dissident dogmatist donkey dour fanatic firm flinty grim hard hard-core hardnose immovable immutable implacable impliable inelastic inexorable inflexible intransigeant iron irreconcilable last-ditcher litigant maverick mule naysayer negativist noncooperator objector obstructionist obstructive opposer oppositionist perverse fool pighead plaintiff positivist protester purist quarreler relentless resister rigid rigorous rock-ribbed scrapper standpat standpatter steely stern stickler stiff unaffected unalterable unbending unchangeable uncompromising ungiving unmoved unrelenting unyielding wrangler