Adjective
fail-secure (not comparable)
Of a device: such that, if it fails, it does so in a way that will cause little or no harm to other devices and personnel.
For example, if a building catches fire, fail-safe systems would unlock doors to ensure quick escape and allow firefighters inside, while fail-secure would lock doors to prevent unauthorized access to the building. Source: Internet
However, as this would allow virtually anyone to go through the gate, a fail-secure design is used: In a power outage, the gate can only be opened by a hand crank that is usually kept in a safe area or under lock and key. Source: Internet
Fail-safe and fail-secure are similar but distinct concepts. Source: Internet