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
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.
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.
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.
The prefix for obsessive would be obsism, and the prefix for fanatical would be fanatism.
Fanatical:being over zealous about a subject.For example: People can be fanatical about their favorite sport,religion,celebrity or hobby etc...A way to use this word in speaking, may be:My brother is SO fanatical about football,he won't go anywhere when a games on!
Because of her fanatical views, her friends know better than to discuss religion with her.
Filled with excessive and single-minded zeal.
Your question is itself a sentence which uses the word "could".
www.thesaurus.com