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.

Not likely to fail
“… flowers have been traditionally regarded as the fail-safe gift for Valentine's Day.”
Guaranteed not to fail
Said of the minimum amount of money (or satellite entries, or other prize) that is guaranteed to make the prize pool in a certain poker tournament
A measure taken to preclude loss or injury
“There are so many fail-safes built into the system that a highly unlikely series of mistakes would have to be made before failure could occur.”
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