firmly or stubbornly adhering to one's purpose, opinion, etc.; not yielding to argument, persuasion, or entreaty.

characterized by inflexible persistence or an unyielding attitude; inflexibly persisted in or carried out

obstinate advocacy of high tariffs.

not easily controlled or overcome

the obstinate growth of weeds.

not yielding readily to treatment, as a disease.

noun

bullheadedness , doggedness , hardheadedness , mulishness , pertinaciousness , pertinacity , perverseness , perversity , pigheadedness , tenaciousness , tenacity , willfulness , disorderliness , fractiousness , indocility , intractability , intractableness , obstinacy , obstreperousness , recalcitrance , recalcitrancy , refractoriness , uncontrollability , uncontrollableness , ungovernableness , unmanageability , untowardness , wildness