Source : Webster's Revised Unabridged Dictionary (1913)

Impetuosity \Im*pet`u*os"i*ty\, n. [Cf. F. imp['e]tuosit['e].]
   1. The condition or quality of being impetuous; fury;
      violence.

   2. Vehemence, or furiousnes of temper. --Shak.

Source : WordNet®

impetuosity
     n : rash impulsiveness [syn: {impetuousness}]