Synonyms of assure

assure

verb

ə-ˈshu̇r 

1

as in to reassure

to ease the grief or distress of

a minister choosing just the right words to assure the grieving parents of the fallen soldier

Synonyms & Similar Words

• reassure
• comfort
• soothe
• cheer
• console
• uplift
• relieve
• sympathize
• solace
• alleviate
• allay
• empathize
• lift
• elevate
• calm
• commiserate
• condole
• assuage
• relax
• buoy (up)
• boost
• quiet
• tranquilize

Antonyms & Near Antonyms

• distress
• discourage
• worry
• trouble
• torment
• torture
• upset
• demoralize
• intensify
• aggravate
• fret
• worsen
• annoy
• irritate
• dishearten
• harass
• irk
• pester

2

as in to ensure

to make sure, certain, or safe

security measures that assured our safety

Synonyms & Similar Words

• ensure
• guarantee
• insure
• secure
• guaranty
• ice
• cinch
• promise
• certify
• vouch
• witness
• warrant
• attest
• pledge
• swear

Antonyms & Near Antonyms

• undermine
• weaken
• enfeeble

Synonym Chooser

How is the word assure distinct from other similar verbs?

Some common synonyms of assure are ensure, insure, and secure. While all these words mean "to make a thing or person sure," assure distinctively implies the removal of doubt and suspense from a person's mind.

I assure you that no harm will be done

How does the word ensure relate to other synonyms for assure?

Ensure, insure, and assure are interchangeable in many contexts where they indicate the making certain or inevitable of an outcome, but ensure may imply a virtual guarantee.

the government has ensured the safety of the refugees

Where would insure be a reasonable alternative to assure?

The synonyms insure and assure are sometimes interchangeable, but insure sometimes stresses the taking of necessary measures beforehand.

careful planning should insure the success of the party

In what contexts can secure take the place of assure?

In some situations, the words secure and assure are roughly equivalent. However, secure implies action taken to guard against attack or loss.

sent reinforcements to secure their position

Example Sentences

Recent Examples of assure

But rest assured that in all her years of teaching, Green hasn’t encountered one student who couldn’t overcome their separation anxiety. — Karin A. Bilich, Parents, 4 Aug. 2026

Between color and contrast, rest assured that visuals will be lifelike yet discernible (and you won’t get picked off by a bad agent hiding in the shadows). — Kelsey Fogarty, PC Magazine, 4 Aug. 2026

While OpenAI assured the public the situation was under control, the pesky agent apparently infected a customer of Modal Labs, an executive of that company confirmed Tuesday. — Clarence Page, Chicago Tribune, 3 Aug. 2026

Jarvis is assured at least one more game, Sunday’s series finale against the Nationals. — Chad Bishop, AJC.com, 2 Aug. 2026