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

Areas at high risk of flooding and where few people are insured tend to be poorer, experts said, as are areas where FEMA’s flood maps don’t properly convey the severity of the risk or mandate that enough people buy coverage. — ABC News, 29 Sep. 2026

But what happens when the other person in the collision isn’t carrying enough insurance — or isn’t insured at all? — Sponsored Content, Denver Post, 29 Sep. 2026

Experts recommend looking for a high-yield savings account that is FDIC- or NCUA-insured, charges no monthly fees and offers a competitive annual percentage yield. — Joshua Sidorowicz, CBS News, 28 Sep. 2026

Bloomberg reported this week that Oracle’s decision to invoke force majeure on a New Mexico data center sent the cost of insuring its debt against default to a record. — Amanda Gerut, Fortune, 26 Sep. 2026