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

Savers will also rest assured knowing that their CD account is FDIC-insured up to $250,000, adding another layer of protection that many will find helpful right now. —Matt Richardson, CBS News, 12 June 2026

The Warriors put the game away in the sixth, sending 11 to the plate and scoring six times to insure its date with Somerset-Berkley in the final. —Matt Roy, Boston Herald, 11 June 2026

Under City of New Britain policy, the finance directors are the officials responsible for insuring the P-Card use complies with city policy that permits card use only in limited circumstances and prohibits personal purchases. —Edmund H. Mahony, Hartford Courant, 11 June 2026

With the federal government insuring loans on 95 percent of the value of low-cost houses at the time, homebuyers had to put down only 5 percent—and that was waived for veterans. —Encyclopedia Britannica, 9 June 2026