The word fanatical isn't a word at all. A trusted linguist told me that the two endings ("ic" and "al") can't be combined because they come from two different language origins.
Fanatical means a person with an extreme and uncritical enthusiasm or zeal, as in religion or politics. The origin came from Latin f?n?ticus belonging to a temple, hence, inspired by a god, frenzied, from f?num temple.
They were fanatical about the team and never missed a match.
Fanatical people are usually irrational, and are not good conversationalists.
The cult's followers were filled with fanatical devotion.
Fanatical They were fanatical followers of the band. Sarah was very fanatical about One Direction, a band. She was crazy fanatical!! Other ways to use it: She was a huge fan. Cody Simpson had millions of fans at his concert.
Filled with excessive and single-minded zeal.
Another word that can be used to replace the word fanatical is the word manic. You could also check a thesaurus for different options, that may fit what you are writing better.
Extremists can be fanatical in their actions in a chosen cause. The temperance leader Carrie Nation was considered fanatical after she began using a hatchet to damage bars and saloons.
www.thesaurus.com
Fanatical, enthusiastic.
obsessed=infatuated
Fanaticism.