Definition of unquestionable adjective from the Oxford Advanced American Dictionary

 

unquestionable

 adjective
adjective
NAmE//ʌnˈkwɛstʃənəbl//
 
 
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that cannot be doubted a man of unquestionable honesty opposite questionable
unquestionably
 
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NAmE//ʌnˈkwɛstʃənəbli//
 
adverb It was unquestionably a step in the right direction.
See the Oxford Advanced Learner's Dictionary entry: unquestionable