fanaticism

noun

fa·​nat·​i·​cism fə-ˈna-tə-ˌsi-zəm 

: fanatic outlook or behavior

Examples of fanaticism in a Sentence

Recent Examples on the Web

Fueled by racial fanaticism, Hitler's Nazi regime killed approximately 6 million Jews and other minorities and groups during the Holocaust. — ABC News, 22 July 2026

Fueled by racial fanaticism, Hitler’s Nazi regime killed approximately 6 million Jews and other minorities and groups during the Holocaust. — Philipp Jenne, Los Angeles Times, 22 July 2026

Where does all this fútbol fanaticism (some newfound, some long-simmering) go? — Tyler Estep, AJC.com, 21 July 2026

By the way they’re subtly disparaged for not being financially irresponsible to declare their fanaticism. — Marcus Thompson Ii, New York Times, 13 June 2026

Word History

First Known Use

1652, in the meaning defined above

Rhymes for fanaticism

• activism
• albinism
• altruism
• aneurism
• animism
• aphorism
• atomism
• barbarism
• bolshevism
• botulism
• brahmanism
• calvinism

Medical Definition

fanaticism

noun

fa·​nat·​i·​cism fə-ˈnat-ə-ˌsiz-əm 

: fanatic outlook or behavior especially as exhibited by excessive enthusiasm, unreasoning zeal, or wild and extravagant notions on some subject