indubitably

adverb

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

   adv.all

   Examples

   It was immediately and indubitably apparent that I had interrupted a scene of lovers.

   Synonyms beyond a doubt beyond a shadow of a doubt beyond doubt

   Source: WordNet 3.0

2. Undoubtedly; unquestionably; in a manner to remove all doubt.

   adverb

   Source: webster1913