Definition of unquestionable adjective from the Oxford Advanced Learner's Dictionary

 

unquestionable

 adjective
adjective
BrE BrE//ʌnˈkwestʃənəbl//
 
; NAmE NAmE//ʌnˈkwestʃənəbl//
 
(formal)
 
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that cannot be doubted a man of unquestionable honesty The advantages of this approach are unquestionable. We have to admire her unquestionable achievements. opposite questionable
See the Oxford Advanced American Dictionary entry: unquestionable