THESAURUS
retardant
complaining, disputatious, disputing, dissentient, dissenting, fractious, noncooperative, objecting, obstructive, on the barricades, proof against, protesting, rebellious, recalcitrant, refractory, reluctant, renitent, repellent, resistant, resisting, resistive, retardative, uncooperative, unsubmissive, unyielding, up in arms, withstanding