adjective
rabid
RAB-id/ˈræbɪd/
Extremely fanatical or furious.
The rabid spectator shouts furiously from his seat.

Etymology
Raging, furious behavior became a term for extreme fury or fanatical intensity.
More examples
- The proposal attracts rabid opposition.
- He is a rabid supporter of the club.
Forms
rabid
Similar words
- fanatical
- Marked by excessive devotion or enthusiasm.
- frenzied
- Marked by uncontrolled excitement or agitation.