Definition of unarguable adjective from the Oxford Advanced American Dictionary

 

unarguable

 adjective
adjective
NAmE//ʌnˈɑrɡyuəbl//
 
(formal)
 
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that nobody can disagree with unarguable proof compare arguable
NAmE//ʌnˈɑrɡyuəbli//
 
adverb She is unarguably one of the country's finest athletes.
See the Oxford Advanced Learner's Dictionary entry: unarguable