Etymology
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indubitably (adv.)

"unquestionably, without a doubt," late 15c., from indubitable + -ly (2).

updated on November 14, 2015

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Definitions of indubitably from WordNet

indubitably (adv.)
in a manner or to a degree that could not be doubted;
it was immediately and indubitably apparent that I had interrupted a scene of lovers
Synonyms: beyond doubt / beyond a doubt / beyond a shadow of a doubt
From wordnet.princeton.edu, not affiliated with etymonline.