open to question; in dispute; doubtful: Whether or not he is qualified for the job is debatable.
capable of being debated.

1425–75; late Middle English < Middle French. See debate, -able

nondebatable, adjective
undebatable, adjective

1. questionable, dubious, arguable, disputable. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
debatable or debateable (dɪˈbeɪtəbəl)
1.  open to question; disputable
2.  law in dispute, as land or territory to which two parties lay claim
debateable or debateable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 15c. (Anglo-Latin), from O.Fr. debatable, from debatre (see debate). Earliest references were to lands claimed by two nations; general sense is from 1580s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The case for evolution presented by this shared ornithological evidence
  nevertheless remained debatable for nearly a decade.
Whether it is appropriate in this story is debatable.
What the government can do to improve the economy is speculative and debatable.
Then you have topics that are ethically debatable, such as lie detection.
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