Definitions:

1. Refers to the quality or state of being rabid. NOUN
   • The rabidness of the animal's behavior was a clear indicator of its rabies infection.
2. Unrestrained excitement or enthusiasm. NOUN
   • The rabidness of the crowd made the protest a violent spectacle.

Synonyms:

• extreme
• fanatical
• frenzy
• obsession
• rabidity
• radical