loser

Short definition from Wiktionary

Noun

1. 1
   A person who loses; one who fails to win or thrive.
2. 2
   Something of poor quality.
3. 3
   A person who is frequently unsuccessful in life.
4. 4
   A contemptible or unfashionable person.
5. 5
   One who or that which loses something, such as extra weight, car keys, etc.
6. 6
   A losing proposition, one that is likely to lose or already has lost (such as a losing bet or, analogously, a predictably fruitless task or errand).
7. 7
   A person convicted of a crime, especially more than once.

Proper noun

1. 1
   A surname from German.