Characterized by extreme or radical views, behavior, or positions; relating to or promoting extremism in ideology, politics, or religion.
From extremist + -ic (adjective suffix). Extremist derives from extreme + -ist (one who practices or believes in). The -ic suffix adds adjectival quality.
Psychologists note that extremistic thinking often involves black-and-white reasoning—the inability to see nuance or middle ground—which is why it's so dangerous in politics, religion, and even personal relationships!
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