That cannot fail; sure to succeed.

Obsolete spelling of fail

(uncountable, slang) Poor quality; substandard workmanship. / (slang) A failure (condition of being unsuccessful) / (slang, US) A failure (something incapable of success)

(slang, US) Unsuccessful; inadequate; unacceptable in some way.

A piece of turf cut from grassland.

present participle of fail

weakness; defect

If what follows is not possible; without.

simple past tense and past participle of fail

unsuccessful / Decayed; worn out. / Bankrupt.