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.

Describing a form of examination etc in which the student either passes or fails, without receiving a specific mark or grade.

(Internet slang) Bad.

(Internet slang) Utter, total failure, especially where success should have been reasonably expected.

plural of epic fail

Third-person singular simple present indicative form of fail at life

(Internet slang) To be or become trapped in poverty, or in a situation where someone is not doing anything productive with their lives; to become a loser.

present participle of fail at life

(UK, slang, derogatory) The Daily Mail newspaper.

plural of fail-safe