The Collaborative International Dictionary of English v.0.48:
Slaughterous \Slaugh"ter*ous\, a. Destructive; murderous. --Shak. --M. Arnold. -- Slaugh"ter*ous*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
slaughterous adj 1: accompanied by bloodshed; "this bitter and sanguinary war" [syn: gory, sanguinary, sanguineous, slaughterous, butcherly]