involving or likely to cause controversy; "a central and contentious element of the book"- Tim W.Ferfuson
inclined or showing an inclination to dispute or disagree, even to engage in law suits; "a style described as abrasive and contentious"; "a disputatious lawyer"; "a litigious and acrimonious spirit"
an arrow that is shot from a crossbow; has a head with four edges
an angry dispute; "they had a quarrel"; "they had words"
have a disagreement over something; "We quarreled over the question as to who discovered America"; "These two fellows are always scrapping over something"