arguable

[ahr-gyoo-uh-buhl]
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:
1605–15; argue + -able

arguably, adverb
nonarguable, adjective
unarguable, adjective
unarguably, adverb
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World English Dictionary
arguable (ˈɑːɡjʊəbəl)
 
adj
1.  capable of being disputed; doubtful
2.  capable of being supported by argument; plausible

arguably (ˈɑːɡjʊəblɪ)
 
adv
(sentence modifier) it can be argued that

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Seeing what was arguably one of the scariest apex predators of all time brought
  back to life-even virtually-was scary enough.
It was arguably the world's first ethnobotanical expedition.
The expertise of the philosophers who focus heavily on matters of faith is
  arguably not so easy to objectively evaluate.
Arguably even less useful than your average history major.
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