From Longman Dictionary of Contemporary Englishfanaticfa‧nat‧ic /fəˈnætɪk/ noun [countable]1EXTREMEsomeone who has extreme political or religious ideas and is often dangerousSYN extremist
fanatics who represent a real danger to democracy
a religious fanatic2LIKE somebody OR somethingsomeone who likes a particular thing or activity very muchSYN enthusiast
a health food fanatic
a fitness fanatic —fanatical adjective
a fanatical sportsman
He was fanatical about tidiness. —fanatically /-kli/ adverbExamples from the Corpusfanatic• Her religious fanaticism has alienated most of her old friends.• But like most people who use these things, I tend not to be a fanatic about the instructions.• Ron's an exercisefanatic.• For fishingfanatics, the riversestuaries and coast offer endlessopportunities.• These highly mobile skirmishers can be used to draw Goblinfanatics out of their unitsprior to a charge by more heavily armed troops.• His parents were religious fanatics who didn't allow him to play with other children.religious fanatic• In December 1980, there was a seriousoutbreak of rioting by religious fanatics in the northern city of Kano.• Pathans are very very orthodox and sometimes religious fanatics.• Born dirt-poor in a southerntown to religious fanatics, he was raised on the Bible and the taunts of others.Originfanatic(1500-1600)Latinfanaticus“made wild or mad by the gods”, from fanum“religious building”