pigheaded (adj.)
- balking
- balky
- bigoted
- bullheaded
- case-hardened
- dogged
- dogmatic
- fanatic
- hardheaded
- headstrong
- intolerant
- intractable
- mulish
- obstinate
- opinionated
- overzealous
- persevering
- pertinacious
- perverse
- restive
- self-willed
- set
- stiff-necked
- strong-willed
- stubborn
- sulky
- sullen
- tenacious
- uncooperative
- unregenerate
- unyielding
- willful