opinionated
adjective
the boy was dutiful and punctilious, however opinionated:
dogmatic, of fixed views, of preconceived ideas, pontifical, doctrinaire, dictatorial, domineering, assertive, cocksure, pompous, self-important, adamant, arrogant;
inflexible, uncompromising, prejudiced, biased, bigoted.
▷antonyms open-minded.