Definitions

1. noun

A person who is extremely enthusiastic and dedicated to a particular cause or activity, often to the point of being unreasonable or extreme.

“The soccer fan was a fanatic, always wearing his team’s jersey and attending every match.”

2. adjective

Extremely enthusiastic or dedicated, often to the point of being unreasonable or extreme.

“The new fitness program was a fanatic workout, pushing participants to their limits.”