obstinate
stubborn
unregenerate
asinine
balking
balky
bigoted
bovid
bovine
bulldogged
bulletheaded
bullheaded
caprid
caprine
case-hardened
cowish
cowlike
deerlike
dogged
dogmatic
equestrian
equine
fanatic
fixed
goatish
goatlike
hardheaded
headstrong
hircine
hoggish
hoofed
horsy
intolerant
intractable
opinionated
overzealous
ovine
persevering
pertinacious
perverse
piggish
pigheaded
refractory
restive
ruminant
self-willed
set
sheepish
sheeplike
stiff-necked
strong-willed
bloody-minded
bulldog
contumacious
disobedient
fractious
froward
hangdog
indeed
obdurate
pig-headed
sulky
unappeasable
untameable
untractable
unyielding
willful
wrongheaded