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arguable

[ahr-gyoo-uh-buh l]
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.
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Origin of arguable

First recorded in 1605–15; argue + -able
Related formsar·gu·a·bly, adverbnon·ar·gu·a·ble, adjectiveun·ar·gu·a·ble, adjectiveun·ar·gu·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unarguably

arguable

adjective
  1. capable of being disputed; doubtful
  2. capable of being supported by argument; plausible
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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

Word Origin and History for unarguably

arguable

adj.

1610s, from argue + -able.

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Online Etymology Dictionary, © 2010 Douglas Harper