Synonyms of insure

insure

verb

in-ˈshu̇r 

as in to ensure

to make sure, certain, or safe

took steps to insure the timely completion of the project

Synonyms & Similar Words

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

Antonyms & Near Antonyms

• undermine
• weaken
• enfeeble

Synonym Chooser

How is the word insure distinct from other similar verbs?

Some common synonyms of insure are assure, ensure, and secure. While all these words mean "to make a thing or person sure," insure sometimes stresses the taking of necessary measures beforehand.

careful planning should insure the success of the party

When can assure be used instead of insure?

In some situations, the words assure and insure are roughly equivalent. However, assure distinctively implies the removal of doubt and suspense from a person's mind.

I assure you that no harm will be done

How is ensure related to other words for insure?

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

When is secure a more appropriate choice than insure?

The words secure and insure can be used in similar contexts, but secure implies action taken to guard against attack or loss.

sent reinforcements to secure their position

Example Sentences

Recent Examples of insure

But the returns are just part of the equation, as that $50,000 principal will be protected and insured, too. — Matt Richardson, CBS News, 16 June 2026

In one of the health plans, for example, an OCPS teacher who insured a spouse or domestic partner would see the per-paycheck costs rise from about $300 this year to $675 next year. — Steven Walker, The Orlando Sentinel, 16 June 2026

The couple would be wise to solicit recommendations from friends – even keeping a running list, just in case, plus agree that anyone coming into the home for repairs needs to be bonded and insured. — R. Eric Thomas, Chicago Tribune, 15 June 2026

While this is not federally required for borrowers taking out proprietary mortgages not insured by the FHA, most state and local governments also require it for these loans. — Kelsey Neubauer, CNBC, 15 June 2026