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

Democratic leaders countered that the subsidies are not a new demand but rather the continuation of a program that has helped keep record numbers of Americans insured since the pandemic – and therefore that the issue could not be delayed. —Christopher Robertson, The Conversation, 7 Oct. 2025

Ascension Wisconsin patients insured by UnitedHealthcare are scrambling to find new doctors or rearrange their health care plans, after contract negotiations between the health system and insurer failed. —Sarah Volpenhein, jsonline.com, 6 Oct. 2025

That’s an awful lot of features to fit into a trailer of this sizes, but an electric pop-top roof helps insure you and your travel buddy never feel cramped. —Bryan Hood, Robb Report, 6 Oct. 2025

The New York Civil Liberties Union and Prisoners’ Legal Services filed a class-action lawsuit to try to insure that the state followed the law, and, in June, 2024, a judge ruled in their favor. —Jennifer Gonnerman, New Yorker, 6 Oct. 2025