noun

1. Poor quality; substandard workmanship.

   “The project was full of fail.”

2. A failure (condition of being unsuccessful)

3. A failure (something incapable of success)

verb

1. To be unsuccessful.

   “Throughout my life, I have always failed.”

2. Not to achieve a particular stated goal. (Usage note: The direct object of this word is usually an infinitive.)

   “The truck failed to start.”

3. To neglect.

   “The report fails to take into account all the mitigating factors.”

Synonyms: fall on one's face, flunk

adjective

1. That is a failure.