ex ‧ trem ‧ is ‧ m /ɪkˈstriːmɪz ə m/ BrE AmE noun [uncountable]
[ Word Family: noun : ↑ extreme , ↑ extremism , ↑ extremist , ↑ extremity ; adjective : ↑ extreme , ↑ extremist ; adverb : ↑ extremely ]
opinions, ideas, and actions, especially political or religious ones, that most people think are unreasonable and unacceptable