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 space insurance market began in 1965, when Lloyds Bank insured Intelsat I, which broadcast the Apollo 11 moon landing. —Tom Brown, Space.com, 28 June 2025

Hazel was charged with engaging police in pursuit, interfering with police, reckless driving, possession of cocaine with intent to sell, possession of a narcotic substance with intent to sell, first-degree reckless endangerment, evading responsibility and failure to insure a motor vehicle. —Justin Muszynski, Hartford Courant, 27 June 2025

The number represents more than one-fifth of the roughly 15 million Californians insured under the state’s low-income health program. —Nicole Nixon, Sacbee.com, 27 June 2025

Each one had to be checked to insure that facts were complete and accurate and that all applicants qualified as residents. —Jack O'Connor, Outdoor Life, 26 June 2025