Definition of “incontrovertible” - English Dictionary

“incontrovertible” in British English

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incontrovertibleadjective

uk /ɪnˌkɒn.trəˈvɜː.tə.bəl/ us /ɪnˌkɑːn.trəˈvɝː.t̬ə.bəl/ formal
incontrovertibly
adverb uk /ɪnˌkɒn.trəˈvɜː.tə.bli/ us /ɪnˌkɑːn.trəˈvɝː.t̬ə.bli/

Your assertion is incontrovertibly true.

(Definition of “incontrovertible” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“incontrovertible” in American English

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incontrovertibleadjective [ not gradable ]

us /ɪnˌkɑn·trəˈvɜr·t̬ə·bəl/ fml

impossible to doubt because obviously true:

incontrovertible proof

(Definition of “incontrovertible” from the Cambridge Academic Content Dictionary © Cambridge University Press)