fail-safe

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Adjective fail-safe has 2 senses

fail-safe - guaranteed not to fail; "a fail-safe recipe for cheese souffle"
Antonyms: insecure, unsafe (indirect, via secure)
fail-safe - eliminating danger by compensating automatically for a failure or malfunction; "a fail-safe device in a nuclear weapon to deactivate it automatically in the event of accident"
Antonyms: dangerous, unsafe (indirect, via safe)

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