Fanatic

A fanatic is someone who has an intense and unwavering passion or belief in a particular idea, cause, or activity. This strong dedication often leads them to prioritize their obsession above other considerations, sometimes disregarding logic or the feelings of others. While enthusiasm can be positive, fanaticism is characterized by excessive devotion that can result in irrational behavior or intolerance toward differing viewpoints. Essentially, a fanatic's commitment goes beyond normal enthusiasm, often impacting their perceptions and actions in extreme ways.