Definitions:

1. Refers to the quality or state of being rabid. NOUN
   • The rabidity of the cult's beliefs blinded its members to reason and compassion.
2. The condition of being infected with rabies. NOUN
   • The rabid dog's foam-flecked mouth seethed with contagious fury.
3. The quality of being extremely enthusiastic, fanatical, or zealous. NOUN
   • The rabidity of the fans was clear as they camped outside the stadium for days before the concert.

Synonyms:

• extremism
• fanatism
• frenzy
• fury
• madness
• mania
• rabidness
• rabies infection
• rage