(a.) Relating to, or consisting of, controversy; disputatious; polemical; as, controversial divinity.

arguable argumental argumentative at issue belligerent cat-and-dog cat-and-doggish combative confutable conjectural contentious contestable controvertible debatable deniable dialectic disputable disputatious doubtable doubtful dubious dubitable eristic factious iffy ill-humored in dispute in doubt in dubio in question litigious logomachic mistakable moot open to doubt open to question pilpulistic polemic polemical pro and con problematic provocative quarrelsome questionable refutable scrappy speculative suppositional suspect suspicious unsettled