fanaticism
Americannoun
noun
Usage
What does fanaticism mean? Fanaticism is an extreme and often unquestioning enthusiasm, devotion, or zeal for something, such as a religion, political stance, or cause. It can also refer to behavior motivated by such enthusiasm or devotion. A person who engages in fanaticism can be called a fanatic, and they or their behavior or beliefs can be described as fanatical. Sometimes, fanatic is used negatively to imply that someone takes such devotion too far, as in They’re considered religious fanatics due to their extreme practices. Close synonyms are extremist, radical, and zealot. Other times, fanatic is not used negatively but instead simply refers to someone who is extreme in their devotion or enthusiasm for an interest or hobby. For example, calling someone a sports fanatic means they’re an extremely enthusiastic fan of sports. In fact, the word fan is a shortening of fanatic. Fanaticism can be used in reference to either kind of fanatic. Example: We dismiss it as fanaticism, but this belief system may be more widespread than we think.
Etymology
Origin of fanaticism
Explanation
Fanaticism occurs when someone is unwilling or unable to accept a differing point of view. You can use the word to describe the endless war between fans of the Boston Red Sox and the New York Yankees. Fanaticism come from the Latin word fanaticus, a word with a meaning that includes the word mad — in both senses. If you're mad, you might be angry — or you might be insane. Fanaticism involves both kinds of madness. Anger at those who disagree with you, taken so far that there's a desire to stop or even harm the dissenters? That's madness — and also fanaticism.
Vocabulary lists containing fanaticism
Power Suffix: -ism
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Their Eyes Were Watching God
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Elie Wiesel's "Hope, Despair and Memory" (1986)
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
"Political hatred has no place in our democracies. We will not allow fanaticism to poison the spaces of free debate and information," she said.
From Barron's • Apr. 26, 2026
Nothing about the very obvious messages here—about colonialism, religious fanaticism, institutionalized violence and the exploitation of native peoples—amounts to a news flash.
From The Wall Street Journal • Apr. 23, 2026
The dedication and fanaticism of Palantir investors may indicate a high element of risk to outsiders, but it has translated into life-changing money for some.
From MarketWatch • Nov. 25, 2025
"Studying fanaticism matters because it reveals generalizable neural mechanisms that can scale from stadium passion to polarization, violence and population-level public-health harm," he said.
From Science Daily • Nov. 11, 2025
He would listen somberly, sigh, and repeat that he had no intention of quarreling with Reb Saunders, he respected his position in spite of its fanaticism.
From "The Chosen" by Chaim Potok
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
