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

 

incontrovertible

 adjective
adjective
BrE BrE//ˌɪnkɒntrəˈvɜːtəbl//
 
; NAmE NAmE//ˌɪnkɑːntrəˈvɜːrtəbl//
 
(formal)
 
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that is true and cannot be disagreed with or denied synonym indisputable incontrovertible evidence/proof The facts were incontrovertible. There is one incontrovertible argument in favour of the changes.
See the Oxford Advanced American Dictionary entry: incontrovertible