wrongheaded (adj.)

• asinine
• balky
• blockish
• bovine
• bullheaded
• cantankerous
• cloddish
• contrary
• crass
• cross-grained
• dense
• difficult
• doltish
• dumb
• duncical
• duncish
• fat
• froward
• gross
• headstrong
• irascible
• lumpish
• mulish
• oafish
• opaque
• ornery
• perverse
• pigheaded
• restive
• self-willed
• sottish
• stiff-necked
• stubborn
• stuffy
• stupid
• sulky
• sullen
• thick
• wayward