Search Result for "loser": 
Wordnet 3.0

NOUN (3)

1. a contestant who loses the contest;
[syn: loser, also-ran]

2. a person with a record of failing; someone who loses consistently;
[syn: failure, loser, nonstarter, unsuccessful person]

3. a gambler who loses a bet;

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5 definitions retrieved:

The Collaborative International Dictionary of English v.0.48:

Loser \Los"er\, n. 1. One who loses; as, the loser pays for a round of beer. --South. [1913 Webster] 2. A person who is habitually unsuccessful at some endeavor, such as employment or personal relationships. [slang] [PJC] 3. A plan or strategy unlikely to succeed. [slang] [PJC]
WordNet (r) 3.0 (2006):

loser n 1: a contestant who loses the contest [syn: loser, also- ran] [ant: victor, winner] 2: a person with a record of failing; someone who loses consistently [syn: failure, loser, nonstarter, unsuccessful person] [ant: achiever, succeeder, success, winner] 3: a gambler who loses a bet [ant: winner]
Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "loser": also-ran, bankrupt, bomb, booby, bummer, bust, clinker, con, defeatee, duck, dud, failure, fall guy, false alarm, fiasco, flop, game loser, good loser, good sport, hard-luck guy, hardcase, jailbird, lag, lemon, misfit, nebbish, poor unfortunate, sad sack, schlemiel, schlimazel, sport, stooge, sure loser, the vanquished, underdog, unfortunate, victim, washout
The Jargon File (version 4.4.7, 29 Dec 2003):

loser n. An unexpectedly bad situation, program, programmer, or person. Someone who habitually loses. (Even winners can lose occasionally.) Someone who knows not and knows not that he knows not. Emphatic forms are real loser, total loser, and complete loser (but not **moby loser, which would be a contradiction in terms). See luser.
The Free On-line Dictionary of Computing (18 March 2015):

loser An unexpectedly bad situation, program, programmer, or person. Someone who habitually loses. (Even winners can lose occasionally). Someone who knows not and knows not that he knows not. Emphatic forms are "real loser", "total loser", and "complete loser" (but not **"moby loser", which would be a contradiction in terms). See luser. [Jargon File] (1995-04-19)