›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 enthusiasticfanatically
/-i/adverb›The band has a fanatically loyal British following.Excited, interested and enthusiasticfanaticism
/-sɪ.zəm/noun[U]Excitement, interest, energy and enthusiasm