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

Companies that insure ships against the risks of traveling in war zones are deciding whether to issue coverage on an individual-ship basis. —Charles Edward Gehrke, The Conversation, 10 Mar. 2026

And Notre Dame is insuring itself against it. —Pete Sampson, New York Times, 9 Mar. 2026

But money market accounts at banks are FDIC-insured. —Christine Benz, Los Angeles Times, 7 Mar. 2026

Trump issued a plan Friday to insure losses up to approximately $20 billion in the Gulf region, aiming to restore confidence in maritime trade, help stabilize international commerce and support American and allied businesses operating in the Middle East. —Cathy Bussewitz, Fortune, 7 Mar. 2026