litigious (adj.) Look up litigious at Dictionary.com
late 14c., "fond of disputes," from Middle French litigieux and directly from Latin litigiosus "contentious, quarrelsome," from litigium "dispute, strife," related to litigare (see litigation). Meaning "fond of engaging in lawsuits" is from 1620s. Earlier in English than litigate or litigation. Related: Litigiousness.