indubitably Meaning, Definition & Usage

  1. adverb in a manner or to a degree that could not be doubted
    beyond a shadow of a doubt; beyond doubt; beyond a doubt.
    • it was immediately and indubitably apparent that I had interrupted a scene of lovers
    • his guilt was established beyond a shadow of a doubt

WordNet

In*du"bi*ta*bly adverb
Definitions
  1. Undoubtedly; unquestionably; in a manner to remove all doubt.
    Oracles indubitably clear and infallibly certain. Barrow.

Webster 1913