1. (a.) Persistently adhering to an opinion; not yielding to reason; stubborn; pertinacious; unreasonable\.

2. (a.) Not yielding; not easily subdued or removed; as, obstinate fever; obstinate obstructions.

adamant adherent adhesive adversary adversative adverse alien antagonistic anti antipathetic antithetic assiduous balking balky beefy bigoted bloody-minded bouncing bound bound and determined bulldogged bulldoggish bulldoggy bulletheaded bullheaded case-hardened clashing clingy closed to closed-minded committed competitive con conflicting constant continuing contradictory contrary contumacious costive counter crabbed cross deaf decided decisive dedicated definite determined devoted diligent disaccordant disobedient dissentient dogged dogmatic doughty dour earnest enduring enemy faithful fanatic firm fixed forceful forcible forcy fractious froward full-blooded full-strength fundamentalist gluey glutinous gummy gutsy gutty hale hard hard as nails hardheaded hardy headstrong hearty hefty hidebound hostile husky immovable immutable impersuadable impersuasible impervious impliable inalterable indefatigable indisciplined indomitable industrious inexorable inflexible inimical insistent intolerant intractable intransigent invincible iron iron-hard ironbound ironclad ironhanded lasting lawless loyal lusty mighty mulish muscle-bound naughty negative nervy never-tiring nonconforming noncooperative obdurate obstipated opinionated opponent opposed opposing opposite oppositional oppositive oppugnant orthodox overthwart overzealous patient patient as Job permanent perseverant persevering persistent persisting pertinacious perverse pigheaded plodding plugging potent powerful preoccupied procrustean puissant purist puristic puritan puritanic purposeful rapt rebellious recalcitrant recusant red-blooded refractory relentless renitent repugnant resistant resolute resolved restive rigid rigorist rigoristic rigorous rival robust robustious rockbound rugged sedulous self-adhesive self-willed serious set sincere single-minded sleepless slogging sot stable stalwart staunch steadfast steady steely stickable sticky stiff stiff-necked stony stout straightlaced straitlaced strapping strong strong as brandy strong as strong strong-willed strongheaded stubborn sturdy sulky sullen tacky tenacious tireless tough transgressive unabating unamenable unbending unchangeable uncomplying uncompromising unconquerable uncooperative undaunted undisciplined undiscouraged undrooping unduteous undutiful unfailing unfaltering unfavorable unflagging unflinching unfriendly unimpressionable uninfluenceable unintermitting uninterrupted unmovable unmoving unnodding unpersuadable unpliable unpliant unpropitious unreceptive