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Undoubtedly vs Indubitable - What's the difference?

undoubtedly | indubitable |

As an adverb undoubtedly

is without doubt.

As an adjective indubitable is

clearly true; providing no possibility of doubt.

As a noun indubitable is

that which is indubitable.

undoubtedly

English

Adverb

(en adverb)
  • Without doubt.
  • * {{quote-book, year=1905, author=
    • , title= , chapter=2 citation , passage=The cane was undoubtedly of foreign make, for it had a solid silver ferrule at one end, which was not English hall–marked.}}

    Synonyms

    * indubitably * unquestionably * doubtlessly * undoubtably

    indubitable

    English

    Adjective

    (en adjective)
  • clearly true; providing no possibility of doubt.
    • The indubitable effect of the potion convinced many unbelievers.

    Synonyms

    * undoubtable

    Derived terms

    * indubitably

    Noun

    (en noun)
  • That which is indubitable.
    • If we build logically upwards from a few indubitables , the whole system must remain correct.