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.
Origin: 1350–1400;Middle English < Latinobstinātus (past participle of obstināre to set one's mind on, be determined), equivalent to ob-ob- + -stin-, combining form of stan- (derivative of stāre to stand) + -ātus-ate1
mid-14c., from L. obstinatus "resolute, inflexible, stubborn," pp. of obstinare "persist, stand stubbornly, set one's mind on," from ob "by" + stinare, related to stare "stand," from PIE base *sta- "to stand" (see stet).