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From The Collaborative International Dictionary of English v.0.48:
Obstinate \Ob"sti*nate\, a. [L. obstinatus, p. p. of obstinare to set about a thing with firmness, to persist in; ob (see Ob-) + a word from the root of stare to stand. See Stand, and cf. Destine.] 1. Pertinaciously adhering to an opinion, purpose, or course; persistent; not yielding to reason, arguments, or other means; stubborn; pertinacious; -- usually implying unreasonableness. [1913 Webster] I have known great cures done by obstinate resolution of drinking no wine. --Sir W. Temple. [1913 Webster] No ass so meek, no ass so obstinate. --Pope. [1913 Webster] Of sense and outward things. --Wordsworth. [1913 Webster] 2. Not yielding; not easily subdued or removed; as, obstinate fever; obstinate obstructions. [1913 Webster] Syn: Stubborn; inflexible; immovable; firm; pertinacious; persistent; headstrong; opinionated; unyielding; refractory; contumacious. See Stubborn. [1913 Webster] -- Ob"sti*nate*ly, adv. -- Ob"sti*nate*ness, n. [1913 Webster]