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fail-safe

adjective

/ˈfeɪl.seɪf/

Meaning

designed to prevent failure or accidents; guaranteed to work correctly

The engineers installed a fail-safe mechanism in the nuclear plant.

secure, foolproof, reliable, dependable

risky, unsafe

fail-safe design, fail-safe system, fail-safe mechanism

unwilling or unable to change because of tradition or convention

sacred; dedicated to God or religious purposes; morally and spiritually excellent

shaking or quivering slightly, often from nervousness or weakness

Bitter and angry, often involving harsh words.

lacking sensitivity, refinement, or intelligence

not drawing attention to oneself; modest