Pronunciation: (ob'stu-nit),[key] —adj. 1. firmly or stubbornly adhering to one's purpose, opinion, etc.; not yielding to argument, persuasion, or entreaty.
2. characterized by inflexible persistence or an unyielding attitude; inflexibly persisted in or carried out: obstinate advocacy of high tariffs. 3. not easily controlled or overcome: the obstinate growth of weeds. 4. not yielding readily to treatment, as a disease.