hardliner

/ˈhɑrdˌlaɪnər/
noun
  1. A person who supports a strict, extreme, or uncompromising set of beliefs or policies, especially in politics.
    • Many hardliners in the government oppose any changes to the current law.
    • He was known as a hardliner on immigration issues.
    • The party's hardliner refused to negotiate with the opposition.
Antonyms