he obstinates himself against all rational arguments.
Examples of obstinate
obstinate
Sanctions can also strangle ordinary citizens instead of obstinate world leaders.
From the time.com
I think you are being inordinately obstinate and ridiculous in your objections.
From the en.wikipedia.org
This fact is routinely ignored by obstinate skeptics and dogmatic materialists.
From the blogs.psychcentral.com
On the negative side, he could be impulsive, obstinate, severe, and autocratic.
From the en.wikipedia.org
This obstinate and often rude man was always honourable and usually sensitive.
From the economist.com
I keep on doing Linux, because once I get started, I'm kind of obstinate that way.
From the techcrunch.com
Obstinate and Pliable go after Christian to bring him back, but Christian refuses.
From the en.wikipedia.org
It's a shame that such great minds have to be so deliberately obstinate and touchy.
From the guardian.co.uk
Unfortunately, the attack was quickly stopped by obstinate German resistance.
From the en.wikipedia.org
More examples
Persist stubbornly; "he obstinates himself against all rational arguments"
Stubborn: tenaciously unwilling or marked by tenacious unwillingness to yield
Cussed: stubbornly persistent in wrongdoing
Contrary: resistant to guidance or discipline; "Mary Mary quite contrary"; "an obstinate child with a violent temper"; "a perverse mood"; "wayward behavior"
(obstinately) stubbornly: in a stubborn unregenerate manner; "she remained stubbornly in the same position"
(obstinacy) stubbornness: the trait of being difficult to handle or overcome
(obstinacy) stubbornness: resolute adherence to your own ideas or desires
Stubbornly adhering to an opinion, purpose, or course, usually with implied unreasonableness; persistent; Said of inanimate things not easily subdued or removed
(obstinateness) The characteristic of being obstinate