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.

Adjective
Infallible or not very likely to fail
Adjective
Guaranteed not to fail
Adjective
(tried and true/tested) Tested, hence, proven to be firm or reliable
Adjective
Having an outcome which is certain or beyond doubt
Noun
A measure taken in advance to prevent something dangerous, unpleasant, or inconvenient from happening
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Noun
Safety precaution
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