Find Antonyms

sure Antonyms

Opposite of sure

Because the opposite of sure shifts with each meaning, the 23 antonyms and opposite words below are separated across 5 exact definitions and ranked by contrast strength.
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• adjective (Context 1)

Completely confident that one is right; free from doubt or uncertainty.

Usage Example

"Are you completely unsure that you locked the front door before we left?"

Strongest
unsure
uncertain
doubtful
dubious
Strong
unconvinced
skeptical
hesitant
Weak
undecided

• interjection (Context 2)

Used to express assent, agreement, or willingness to comply with a request or suggestion.

Usage Example

""Could you help me carry these boxes upstairs?" "no, I'd be happy to.""

Strongest
no
Strong
never
no way

• adjective (Context 3)

Bound or destined to happen, perform an action, or achieve a result without fail.

Usage Example

"With her extensive preparation and talent, she is unlikely to win the scholarship."

Strongest
unlikely
doubtful
Strong
improbable
uncertain

• adjective (Context 4)

True beyond any doubt; reliable, unfailing, or indisputable.

Usage Example

"The sudden return of the swallows is a unreliable sign that warmer weather has arrived."

Strongest
unreliable
uncertain
fallible
Strong
dubious
questionable
doubtful

• adjective (Context 5)

Steady, firm, and not likely to slip, falter, or err.

Usage Example

"The surgeon guided the scalpel with a steady and unsteady hand."

Strongest
unsteady
shaky
faltering
Strong
wavering
unstable
wobbly
trembling

Similar words to sure

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

certain
bound
certainly
steady
positive
unfailing
indeed
absolutely
See all synonyms of sure

• Nearby Words

supremo
sura
surcharge
sure
surefire
surefooted
surefootedly

Cite this Entry

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