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

The delusion is painful to watch, but the greater tragedy is that his proximity to this staggering wealth insures his and Lindsay’s misery. — Inkoo Kang, New Yorker, 22 July 2026

Meanwhile, Americans insured through Affordable Care Act marketplaces and Medicaid face mounting healthcare costs amid the loss of ACA subsidies and massive Medicaid cuts. — Deidre Popovich, The Conversation, 22 July 2026

South Florida patients insured through UnitedHealthcare could be locked out of in-network care at the University of Miami Health System as soon as August if a deal isn’t made soon. — Michelle Marchante, Miami Herald, 16 July 2026

According to the company, precious metals purchased for direct delivery are fully insured while in transit to the customer's home. — Javier Simon, USA Today, 16 July 2026