fanatic

adjective
1
holding, expressing or connected with extreme or dangerous opinions
متعصب, افراطی, تندرو, افراط‌پیشه
noun
1
a person who holds extreme or dangerous opinions
افراطی, متعصب, تندرو
synonym extremist
2
a person who is extremely enthusiastic about something
متعصب, افراطی, شیفته افراطی
a fitness/crossword fanatic
a self-confessed football fanatic
synonym enthusiast