mulish (adj.)
- asinine
- balking
- balky
- bigoted
- bovid
- bovine
- bullheaded
- caprine
- case-hardened
- dogged
- dogmatic
- equestrian
- equine
- fanatic
- fixed
- hardheaded
- headstrong
- hircine
- hoggish
- hoofed
- intolerant
- obstinate
- opinionated
- overzealous
- ovine
- persevering
- pertinacious
- perverse
- piggish
- pigheaded
- refractory
- restive
- ruminant
- self-willed
- set
- sheepish
- sheeplike
- stiff-necked
- strong-willed
- stubborn
- sulky
- sullen
- swinish
- tenacious
- uncooperative
- ungovernable
- ungulate
- unregenerate
- unruly
- willful
- wrongheaded
