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English definition of “fanatical”

fanatical

adjective uk   /fəˈnæt.ɪ.kəl/ us    /-ˈnæt̬-/
describes someone whose admiration for something is considered to be extreme or unreasonable: His enthusiasm for aerobics was almost fanatical. Gary's fanatical about football.Excited, interested and enthusiastic
fanatically
adverb uk   /-i/ us  
The band has a fanatically loyal British following.Excited, interested and enthusiastic
fanaticism
noun [U] uk   /-sɪ.zəm/ us  
Excitement, interest, energy and enthusiasm
(Definition of fanatical from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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