Synonyms for Narrow-minded (same or very similar meaning)
WordNet sense 1 (belonging to or characteristic of a sect):
sectarianWordNet sense 2 (contemptibly narrow in outlook):
pettyWordNet sense 3 (obstinate in your opinions):
opinionatedWordNet sense 4 (lacking tolerance or flexibility or breadth of view):
narrowFrom the ODE community, based on WordNetadd/edit