Pertinaciously adhering to an opinion, purpose, or course; persistent; not yielding to reason, arguments, or other means; stubborn; pertinacious; -- usually implying unreasonableness.

persist stubbornly; "he obstinates himself against all rational arguments"

stubbornly persistent in wrongdoing

Inaccessible to the truth as it is manifest in the splendor and stress of our advocacy. The popular type and exponent of obstinacy is the mule, a most intelligent animal.

resistant to guidance or discipline; "Mary Mary quite contrary"; "an obstinate child with a violent temper"; "a perverse mood"; "wayward behavior"

Having tenacity, perseverance, dogged resolution, a ruling passion, being willful, acting with determination.

Not yielding; not easily subdued or removed; as, obstinate fever; obstinate obstructions.