Source : Webster's Revised Unabridged Dictionary (1913)

Disputable \Dis`pu*ta*ble\ (?; 277), a. [L. disputabilis: cf. F.
   disputable. See {Dispute}, v. i.]
   1. Capable of being disputed; liable to be called in
      question, controverted, or contested; or doubtful
      certainty or propriety; controvertible; as, disputable
      opinions, propositions, points, or questions.

            Actions, every one of which is very disputable.
                                                  --Jer. Taylor.

   2. Disputatious; contentious. [Obs.] --Shak.

Source : WordNet®

disputable
     adj 1: capable of being disproved [syn: {debatable}]
     2: open to argument or debate; "that is a moot question" [syn:
        {arguable}, {debatable}, {moot}]