extremism

noun

1. (countable, uncountable)Extreme ideas or actions, primarily in politics or religion.

   “For a student of American history and a foreigner like myself, it is easier to understand all these extremisms of conscience.”

   “Echoing the views of my colleagues from the region and beyond, I told the Security Council on Feb. 18, 2003, that while the ramifications of the war could go beyond anyone’s calculations, “one outcome is almost certain: extremism stands to benefit enormously from an uncalculated adventure in Iraq.””