(a.) Liable to be disputed; subject to controversy or contention; open to question or dispute; as, a debatable question\.

arguable at issue confutable conjectural contestable controversial controvertible deniable disputable doubtable doubtful dubious dubitable iffy in dispute in doubt in dubio in question mistakable moot open to doubt open to question polemic polemical problematic problematical questionable refutable speculative suppositional suspect suspicious uncertain undecided unsettled unsure