noun
a person or thing that is unsuccessful or ineffective
verb
to be unsuccessful in achieving a goal or passing a test
adjective
not successful or effective
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The project was deemed a fail due to numerous errors in the code.
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I knew I would fail the test if I didn't study.
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Don't worry, everyone fails sometimes. It's no biggie.
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His attempt to win her over was a fail, as she was not interested in him at all.