Source : Webster's Revised Unabridged Dictionary (1913)

Bloodthirsty \Blood"thirst`y\, a.
   Eager to shed blood; cruel; sanguinary; murderous. --
   {Blood"thirst`i*ness} (?), n.

Source : WordNet®

bloodthirstiness
     n : cruelty evidence by a capability to commit murder [syn: {murderousness}]