From Longman Dictionary of Contemporary Englishextremismex‧trem‧is‧m /ɪkˈstriːmɪzəm/ noun [uncountable] EXTREMEopinions, ideas, and actions, especially political or religious ones, that most people think are unreasonable and unacceptable
Examples from the Corpus
extremism• The first is that it will be harder for the Tories to portray Labour as a party gripped by extremism.• But we do all recognise that without that balance, in certain instances, absolutism can easily spill over into extremism.• The irony is that our very success seems to breed more extremism in the environmental community and greater detachment from reality.• Rather than reacting against the political orientations of their families, they tend to extend the extremism of their families' views.• The extremism of the antagonistic, Western, post-Stalinist critic is mirrored in the extremism of the sycophantic Stalinist party apparatchik.• Nor has he condemned right-wing extremism without condemning the rarer left-wing sort in the same breath. 