What does fanaticism mean?
Fanaticism refers to excessive, uncompromising zeal for a cause, belief, or pursuit — an intensity of commitment so great that it crowds out doubt, moderation, and tolerance of opposing views. The word carries firmly negative connotations: to call someone's behaviour fanaticism is to suggest irrationality and intolerance rather than admirable dedication. It appears most often in discussions of religion, politics, and ideology, where history offers grim examples of believers willing to persecute or die for their convictions, but it is also applied more loosely to obsessive enthusiasm for sport, celebrity, or pastimes. In everyday usage it functions as a serious accusation, so writers typically reserve it for genuinely extreme cases rather than mere eagerness. Understanding the term matters because it marks the line societies draw between passionate conviction and dangerous excess — a boundary invoked constantly in debates about extremism, cults, and radicalisation.
nounExcessive, intense, and often irrational zeal or enthusiasm for a cause, belief, or activity, especially when accompanied by an unwillingness to tolerate opposing views.
- Excessive and intolerant zeal or enthusiasm for a religious, political, or ideological cause.
- Obsessive, single-minded enthusiasm for an activity or interest (e.g. sports fanaticism).
"His religious fanaticism alienated even his closest friends, who found his certainty impossible to argue with."
"The sect's fanaticism led its members to reject all contact with the outside world."
"What began as a harmless hobby curdled into fanaticism, consuming his savings and his weekends alike."
Rarely used; 'fanaticism' is normally treated as uncountable. The plural appears mainly in scholarly contexts comparing different kinds of fanaticism.
"The book traces the various fanaticisms that swept Europe in the seventeenth century."
The word 'fanatic' comes from the Latin 'fanaticus', meaning 'inspired by a temple or deity' — originally a compliment for divine madness, now a warning label for dangerous obsession.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fanaticism
Fanaticism derives from the Latin 'fanaticus', meaning 'pertaining to a shrine or temple' and, by extension, 'inspired by a deity' — describing frenzied, divinely driven behaviour such as that of the Bacchantes. The Latin root 'fanum' means 'temple' or 'sanctuary'. The word entered English via the adjective 'fanatic' in the early 16th century, and the noun 'fanaticism' followed in the mid-17th century during periods of intense religious conflict, when claims of divine inspiration were increasingly viewed with suspicion. Related words sharing this lineage include 'fanatical' and, through a separate semantic evolution from 'fanatic', the modern informal term 'fan'.
Related word forms
How fanaticism is actually used
Fanaticism is a formal-to-neutral noun with strongly negative connotations; it implies not just intensity of commitment but intolerance and disregard for reason or opposing views. It is most often applied to religion and politics, though it can be used (sometimes hyperbolically) for hobbies and fandoms. The plural 'fanaticisms' exists but is rare and mostly academic.
Easily confused with fanaticism
Enthusiasm is eager and lively interest in something, while fanaticism implies excessive, intolerant devotion that dismisses reason and opposing views.
Devotion is loyal dedication that can remain balanced and open-minded, whereas fanaticism is devotion carried to an extreme and intolerant degree.