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Definition of undoubtedly

undoubtedly

/ʌnˈdaʊtɪdli/
un · doubt · ed · ly
Adjective:undoubted
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undoubtedly Lexical Profile

undoubtedly Game Scores & Validity

• adverb

1

Without doubt; certainly; unquestionably.

Example

"This discovery is undoubtedly one of the most significant scientific breakthroughs of the decade."

Synonyms
View all synonyms for undoubtedly
Antonyms
View all antonyms for undoubtedly

Word Nuance & Usage

'Undoubtedly' means without any doubt (certainly), whereas 'indubitably' is a much more formal and sometimes rhetorical equivalent; avoid confusing either with the nonstandard form 'undoubtably'.

• Nearby Words

undotted
undoubtable
undoubted
undoubtedly
undoubtful
undrainable
undrained

Word Origin & Etymology

Formed in Middle English from the adjective 'undoubted' plus the adverbial suffix '-ly'; the root 'doubt' derives from Old French 'douter' and Latin 'dubitare' ('to waver in opinion' or 'hesitate').

Cite this Entry

Wordmom. (2026). Definition of Undoubtedly. In Wordmom Dictionary. Retrieved Nov 3, 2026, from https://wordmom.com/dictionary/undoubtedly
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