narrow-minded (adj.)

• biased
• bigoted
• conservative
• conventional
• fundamentalist
• hidebound
• illiberal
• intolerant
• narrow
• old-fashioned
• one-sided
• opinionated
• parochial
• petty
• prejudiced
• puritanical
• reactionary
• small-minded
• square
• stiff-necked
• strait-laced
• stuffy
• unprogressive