Find Antonyms

certainly Antonyms

Opposite of certainly

Because the opposite of certainly shifts with each meaning, the 11 antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
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• adverb (Context 1)

Without any doubt; definitely or unquestionably.

Usage Example

"The new research findings will doubtfully influence how scientists approach climate modeling in the future."

Strongest
doubtfully
questionably
Strong
dubiously
uncertainly
possibly
perhaps
maybe

• interjection (Context 2)

Used in conversation to express polite, enthusiastic, or emphatic agreement or consent to a request or question.

Usage Example

""Could you please pass me the conference schedule?" "no, here it is.""

Strongest
no
never
Strong
no way
by no means

Similar words to certainly

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

definitely
unquestionably
of course
undoubtedly
absolutely
admittedly
by all means
indubitably
See all synonyms of certainly

• Nearby Words

ceremoniously
ceremony
certain
certainly
certainness
certainty
certifiable

Cite this Entry

Wordmom. (2026). Antonyms for Certainly. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/certainly
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