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Fail-safe

adj. resilient, capable professional

What it means

Designed to enter or preserve a safe condition when a component or process fails.

Reach for it when praising a safety design whose failure behavior has been deliberately controlled

A fail-safe latch releases the gate if the motor loses power.

Words to choose between 7

By register, from playful at the top to literary at the bottom. Tap a word to see when it fits.
everyday
professional
formal

  • everyday

    error-proof

    Fits when a process is arranged to prevent common user mistakes

    Careful Error-proof overpromises when hardware failure remains possible.

  • everyday

    foolproof

    Fits when simplicity makes misuse unlikely in casual explanation

    Careful Foolproof can sound absolute and dismissive of unusual failure modes.

  • professional

    fault-tolerant

    Fits when continued operation despite a component failure is the requirement

    Careful Fault-tolerant equipment may keep running without moving into the safest state.

  • professional

    interlocked

    Fits when one action must be blocked until a safe condition exists

    Careful An interlock addresses a defined sequence, not every possible failure.

  • professional

    redundant

    Fits when backup components provide another route after failure

    Careful Redundancy improves resilience but does not by itself guarantee safe failure behavior.

  • professional

    safe-by-default

    Fits when the ordinary fallback state should minimize harm

    Careful Safe-by-default describes a design principle rather than a tested mechanism.

  • formal

    self-protecting

    Fits when the system automatically prevents damage to itself

    Careful Self-protection may safeguard the machine while leaving users exposed.

Opposites 4

  • hazardous
  • failure-prone
  • unprotected
  • single-point vulnerable

Common phrases 4

  • fail-safe mechanism

    The boiler's fail-safe mechanism shuts the fuel valve automatically.

  • fail-safe mode

    The controller enters fail-safe mode when sensor readings conflict.

  • fail-safe brake

    A fail-safe brake holds the lift during a power loss.

  • fail-safe design

    The review documented how each fail-safe design responds to a broken cable.

Definitions and examples are written for this site. How words are chosen Recording: Vealhurl, Southern England accent, from Wikimedia Commons, CC BY-SA 4.0 Updated