if that condition is not met, otherwise, or else

(obsolete) To come short of accomplishing (a purpose); to fail to do.

That cannot fail; sure to succeed.

plural of epic fail

(Internet slang) Bad.

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

plural of failed state

(politics) A state that has failed to meet the basic conditions and responsibilities of a sovereign government; one that has lost physical control of its territory, the ability to provide public services, etc.

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

(idiomatic) Certainly; by all means; as a matter of importance