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Indubitably vs Irrefutable - What's the difference?

indubitably | irrefutable |

As an adverb indubitably

is in a manner that leaves no possibility of doubt; undoubtedly.

As an adjective irrefutable is

undeniable; unable to be disproved or refuted.

indubitably

English

Adverb

(-)
  • In a manner that leaves no possibility of doubt; undoubtedly.
  • * 1871 , , Desperate Remedies , ch. 18:
    • Now his first suspicion was indubitably confirmed.
  • * 1907 , ":
    • The world is indubitably' one if you look at it in one way, but as ' indubitably is it many, if you look at it in another. It is both one and many—let us adopt a sort of pluralistic monism.

    Usage notes

    Currently particularly used as a humorous interjection, particularly in American English, and seen as somewhat affected, if not outright campy. Compare this use by comedy cartoon (Alex Hopper) (US, 1947–65).

    Synonyms

    * undoubtably, unquestionably, doubtlessly, assuredly, certainly, sure thing, without a doubt

    Related terms

    * indubitable

    References

    * * * Oxford English Dictionary , 2nd ed., 1989. English modal adverbs

    irrefutable

    English

    Adjective

    (en adjective)
  • undeniable; unable to be disproved or refuted

    • Antonyms

    * refutable