That may be disputed; liable to be called in question, controverted, or contested; controvertible: as, disputable statements, propositions, arguments, points, or cases.
Disputatious; contentious.
the GNU version of the Collaborative International Dictionary of English
adjective.
Capable of being disputed; liable to be called in question, controverted, or contested; or doubtful certainty or propriety; controvertible.