Indubitably

//ɪnˈdjuː.bɪ.tə.bli// adv

Definitions

Adverb
  1. 1
    In a manner that leaves no possibility of doubt.

    "Near-synonyms: verifiably, provably"

Adverb
  1. 1
    in a manner or to a degree that could not be doubted wordnet

Etymology

From indubitable + -ly.

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