susceptible to debate, challenge, or doubt; questionable: Whether this is the best plan of action or not is arguable.
susceptible to being supported by convincing or persuasive argument: Admirers agree that it is arguable he is the finest pianist of his generation.

1605–15; argue + -able

arguably, adverb
nonarguable, adjective
unarguable, adjective
unarguably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To arguable
World English Dictionary
arguable (ˈɑːɡjʊəbəl)
1.  capable of being disputed; doubtful
2.  capable of being supported by argument; plausible

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It's arguable whether pumpkin even makes the best kind of filling for a pumpkin
The opinion need not be subtle or original, as long as it is arguable.
Whether anyone who knows any history could be so mistaken is arguable.
But given the cutbacks in non loan aid, rising tuitions it is arguable the
  average student and family are desperate.
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