Synonyms of ensure

ensure

verb

in-ˈshu̇r 

as in to assure

to make sure, certain, or safe

regulations that ensure the wholesomeness of our food

Synonyms & Similar Words

• assure
• guarantee
• insure
• secure
• guaranty
• ice
• cinch
• promise
• certify
• vouch
• witness
• warrant
• pledge
• swear
• attest

Antonyms & Near Antonyms

• undermine
• weaken
• enfeeble

Synonym Chooser

How is the word ensure distinct from other similar verbs?

Some common synonyms of ensure are assure, insure, and secure. While all these words mean "to make a thing or person sure," 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

Where would assure be a reasonable alternative to ensure?

The meanings of assure and ensure largely overlap; however, assure distinctively implies the removal of doubt and suspense from a person's mind.

I assure you that no harm will be done

When could insure be used to replace ensure?

Although the words insure and ensure have much in common, insure sometimes stresses the taking of necessary measures beforehand.

careful planning should insure the success of the party

When is secure a more appropriate choice than ensure?

The words secure and ensure 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 ensure

Kidman, who recently celebrated her 59th birthday, ensured Antonia’s 55th birthday celebration was one for the books with a luxurious stop in Portofino. — Lara Walsh, InStyle, 18 July 2026

The model relies on requirements being defined earlier in the process and changes being approved more quickly, with the aim of reducing delays and ensuring vessels are ready for their missions upon delivery. — Atharva Gosavi, Interesting Engineering, 18 July 2026

Once a protocol is started, testosterone replacement requires monitoring to ensure that treatment is effective as well as monitoring for side effects. — Alexander P. Cole, STAT, 18 July 2026

After both of their parents died when Darline Graham was only 13, her old brother became her legal guardian and later adopted her, to ensure his military benefits would flow to her. — Meg Kinnard, Chicago Tribune, 17 July 2026