The Collaborative International Dictionary of English v.0.48:
litigatious \litigatious\ adj. 1. of or pertaining to litigation. Syn: litiginous. [WordNet 1.5] 2. prone to initiate litigation. Syn: litiginous. [PJC] 3. same as contentious. Syn: litigatious, litiginous, contentious, disputatious; quarrelsome; argumentative. [PJC]