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undoubtedly Synonyms

Another word for undoubtedly

Choosing another word for undoubtedly that fits your sentence is easier when synonyms and similar words are paired with an exact adverb definition and ranked by match strength.
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• adverb (Context 1)

Without doubt; certainly; unquestionably.

Usage Example

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

Strongest
unquestionably
indubitably
certainly
undeniably
indisputably
definitely
doubtless
Strong
surely
assuredly
clearly

Opposites of undoubtedly

The opposite of undoubtedly shifts depending on context. Common opposites include:

doubtfully
questionably
dubiously
uncertainly
possibly
perhaps
See all opposites of undoubtedly

• Nearby Words

undotted
undoubtable
undoubted
undoubtedly
undoubtful
undrainable
undrained

Cite this Entry

Wordmom. (2026). Synonyms for Undoubtedly. In Wordmom Thesaurus. Retrieved Nov 3, 2026, from https://wordmom.com/synonyms/undoubtedly
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