Definitions

1. noun

A person who feels a strong enthusiasm or interest in a particular subject or activity.

“She was a passionate enthusiast of art history.”

2. noun

A person who is very keen or enthusiastic about something, especially in a way that is considered excessive or irrational.

“His enthusiasm for the new video game was evident from his loud and excited comments online.”

3. adjective

Having or showing a great enthusiasm or interest, especially in a way that is considered excessive or irrational.

“The enthusiastic crowd sang along to the concert.”