WordNet (r) 3.0 (2006):

predacious
    adj 1: hunting and killing other animals for food [syn:
           predacious, predaceous]
    2: living by or given to victimizing others for personal gain;
       "predatory capitalists"; "a predatory, insensate society in
       which innocence and decency can prove fatal"- Peter S.
       Prescott; "a predacious kind of animal--the early geological
       gangster"- W.E.Swinton [syn: predaceous, predacious,
       predatory]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "predacious":
   all-devouring, all-engulfing, bloodsucking, cannibal,
   cannibalistic, carnivorous, commensal, dietetic, dining, eating,
   extortionate, feeding, flesh-eating, fruitarian, gastronomic,
   gluttonous, grabby, grain-eating, graminivorous, granivorous,
   grasping, grass-eating, herbivorous, insect-eating, insectivorous,
   lactovegetarian, looting, lupine, man-eating, marauding,
   meat-eating, mensal, nourishing, nutritious, omnivorous,
   omophagous, pantophagous, parasitic, phytivorous, phytophagous,
   pillaging, plant-eating, plundering, plunderous, postprandial,
   prandial, predatory, preprandial, rapacious, raptorial, ravaging,
   ravening, ravenous, sharkish, spoliatory, vegetable-eating,
   vegetarian, vulturine, vulturous, wolfish