Loser (noun)
A person who loses; one who fails to win or thrive.
“winner”
“In a two-horse race there is always one winner and one loser.”
“He was always a good loser.”
Loser (noun)
Something of poor quality.
Loser (noun)
A person who is frequently unsuccessful in life.
“failure”
“That guy is a born loser!”
“I’m a constant loser in love.”
Loser (noun)
A contemptible or unfashionable person.
“losel|q=archaic”
Loser (noun)
One who or that which loses something, such as extra weight, car keys, etc.
Wiktionary