extremismn.
英 ɪk'striːmɪz(ə)m; ek- | 美 ɪk'strimɪzəm
中文n. 极端主义（尤指政治上的极右或极左）；极端性；过激主义
词根词源
extremism (n.)"disposition to go to extremes in doctrine or practice," 1848, from extreme + -ism.
I would remind you that extremism in the defense of liberty is no vice! And let me remind you also that moderation in the pursuit of justice is no virtue. [Barry Goldwater (1909-1998), acceptance speech as Republican candidate for President, 1963]
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