D defs.my
Entry 1 sense Webster, 1913

Indubitably

· In·du·bi·ta·bly · IPA /ɪnˈdu.bɪ.tə.bli/
01 adv. Undoubtedly; unquestionably; in a manner to remove all doubt.
  1. 1.
    Undoubtedly; unquestionably; in a manner to remove all doubt.
    “Oracles indubitably clear and infallibly certain.” Barrow.