Definitions

1. noun

A person who belongs to a cult, especially one who is enthusiastic or fanatical about it

“The police were investigating the cultist who had been involved in a series of bizarre rituals”

2. noun

A person who has a strong devotion or enthusiasm for something, especially a hobby or a particular interest

“He’s a bit of a cultist when it comes to classic cars, always restoring old models in his garage”

3. noun

A person who is devoted to a particular activity or interest to an unhealthy or excessive extent

“The gamer’s parents were worried about his cultist behavior, spending all day playing video games”