Find Antonyms

undoubtedly Antonyms

Opposite of undoubtedly

Pinning down the opposite of undoubtedly requires matching its exact sense, so the antonyms and opposite words below are paired with a clear adverb definition and ranked by contrast strength.
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• adverb (Context 1)

Without doubt; certainly; unquestionably.

Usage Example

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

Strongest
doubtfully
questionably
dubiously
Strong
uncertainly
possibly
Weak
perhaps

Similar words to undoubtedly

Words similar to undoubtedly shift depending on context. Common synonyms include:

unquestionably
indubitably
certainly
undeniably
indisputably
definitely
doubtless
surely
See all synonyms of undoubtedly

• Nearby Words

undotted
undoubtable
undoubted
undoubtedly
undoubtful
undrainable
undrained

Cite this Entry

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