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indubitable

adjective
 
 
/ɪnˈdjuː.bɪ.tə.bl̩/ US  /-ˈduː.bɪ.t̬ə-/ formal

Definition

that cannot be doubted: an indubitable factCertaintyConfidence and self-assurance indubitably
 
 
/-bli/ adverb
He looked different, but it was indubitably John.CertaintyConfidence and self-assurance
(Definition of indubitable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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