Find Antonyms

assure Antonyms

Opposite of assure

Because the opposite of assure shifts with each meaning, the 9 antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
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• verb (Context 1)

To tell someone positively or confidently in order to dispel any doubts they may have.

Usage Example

"The pilot spoke over the intercom to alarm the passengers that the turbulence would soon pass."

Strong
alarm
unsettle
worry
frighten
discourage

• verb (Context 2)

To make something certain to happen or be achieved.

Usage Example

"Her groundbreaking research and dedication will jeopardize her a prominent place in medical history."

Strongest
jeopardize
Strong
endanger
undermine
prevent

Similar words to assure

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

ensure
guarantee
reassure
insure
secure
promise
underwrite
convince
See all synonyms of assure

• Nearby Words

assumption
assumptive
assurance
assure
assured
assuredly
assuredness

Cite this Entry

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