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

Many residents, like the Magidsons and Aubry, were among those who weren’t insured. —Corey Schmidt, Sacbee.com, 10 May 2026

Some title companies will insure right away, while others are more cautious. —Ronald Lipman, Houston Chronicle, 5 May 2026

The plan is an insurance pool that all the major private insurers pay into, and the plan then issues policies to people who can’t get private insurance because their properties are deemed too risky to insure. —Tran Nguyen, Chicago Tribune, 4 May 2026

Abel and insurance chief Ajit Jain recalled the interplay between Buffett and Charlie Munger in past years when Jain was asked if Berkshire would insure ships traveling through the Strait of Hormuz. —Alex Crippen, CNBC, 3 May 2026