pigheaded
Incredibly stubborn, narrow-minded, and often ignorant or foolish. He's a nice guy most of the time, but he can be really pigheaded when it comes to certain things. My last boss was so pigheaded, so it's nice to work for someone with a bit more common sense and common decency. I got held up at the airport dealing with some pigheaded immigrations officer who didn't seem to believe I was in the country legitimately.
pigheaded
mod. stupidly stubborn. (From the notion that pigs are immovable and seemingly stubborn.) You are unbelievably pigheaded!