–noun
1.
an act of consistent failings or proving unsuccessful; lack of success.
2.
repeated nonperformance of something due, required, or expected: a failure to do what one has promised; a failure to appear.
3.
a subnormal quantity or quality; an insufficiency.
4.
deterioration or decay, esp. of vigor, strength, etc.
5.
a person or thing that proves consistently unsuccessful.