doc·tri·naire 
/ˌdɑ:ktrəˈneɚ/ adjective
/ˌdɑ:ktrəˈneɚ/ adjective [more doctrinaire; most doctrinaire] formal + disapproving — used to describe a person who has very strong beliefs about what should be done and will not change them or accept other people's opinions ▪ The senator is less doctrinaire than generally believed. ▪ a doctrinaire conservative/socialist
