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What is another word for fail-safe?

Need synonyms for fail-safe? Here's a list of similar words from our thesaurus that you can use instead.

Infallible or not very likely to fail
“The fail-safe plan ensured that every possible scenario was considered and accounted for, making it nearly impossible for any failure to occur.”
Guaranteed not to fail
“The fail-safe system installed in the airplane ensures that all critical functions will operate without any chance of failure.”
(of a product) Consistently good in quality or performance
Having an outcome which is certain or beyond doubt
Accurate or reliable, especially in terms of information provided
(archaic) A safeguard or source of protection
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“The fail-safe for our computer system ensures that all sensitive data is encrypted and protected from any potential security breaches.”
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