WordWeb Online

1. Unrestrained excitement or enthusiasm
   "poetry is a sort of divine rabidity";
   - madness, rabidness
    
2. The property of being very extreme, unreasonable, or fanatical in opinion; excessively zealous; comparable to one with rabies.
   "Ten years since Joss Whedon's western-in-space cult classic Firefly went off the air, the rabidity of its fandom, better known as the Browncoats, hasn't waned at all."

Derived forms: rabidities

Type of: bloody-mindedness [Brit], bullheadedness, ebullience, enthusiasm, exuberance, obstinacy, obstinance, pigheadedness, self-will, stubbornness