militant

/ˈmɪlɪtənt/
adjective
  1. Having or showing a strong, aggressive, or combative attitude, especially in support of a political or social cause.
    • The group became more militant after the government ignored their demands.
    • His militant speeches often stirred up strong emotions in the crowd.
    • She wrote a militant article calling for immediate action on climate change.
noun
  1. A person who is aggressively active in supporting a political or social cause, often willing to use extreme methods.
    • Several militants were arrested during the protest.
    • The militants refused to negotiate until their demands were met.
    • He was known as a militant who would not back down from a fight.