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arguable

[ahr-gyoo-uh-buh l] /ˈɑr gyu ə bəl/
adjective
1.
susceptible to debate, challenge, or doubt; questionable:
Whether this is the best plan of action or not is arguable.
2.
susceptible to being supported by convincing or persuasive argument:
Admirers agree that it is arguable he is the finest pianist of his generation.
Origin
1605-1615
1605-15; argue + -able
Related forms
arguably, adverb
nonarguable, adjective
unarguable, adjective
unarguably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un arguable

arguable

/ˈɑːɡjʊəbəl/
adjective
1.
capable of being disputed; doubtful
2.
capable of being supported by argument; plausible
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un arguable

arguable

adj.

1610s, from argue + -able.

Online Etymology Dictionary, © 2010 Douglas Harper
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