loser

Compared meaning: a person who is unsuccessful (noun).

比较义项：失败者（名词）。

• failure

  More formal and somewhat gentler; describes someone, often oneself, who has not achieved a goal or lived up to expectations, without necessarily implying mockery.

  语气更正式、更温和；用来形容某人（常常是自称）未能达成目标或辜负期望，不一定带有嘲讽意味。

  After his business collapsed, he began to see himself as a failure.

  他的生意倒闭后，他开始把自己看作一个失败者。

• loser 本词

  Informal and often insulting; used to mock or belittle someone, especially for losing a game, competition, or being seen as socially unsuccessful.

  较为口语化，常带侮辱色彩；用来嘲笑或贬低某人，尤其是在输掉比赛、竞争，或被视为社交上不成功的人。

  Kids on the team teased him and called him a loser for missing the shot.

  队里的孩子们嘲笑他，因为投篮没进就骂他是个失败者。

Both words mean a person who did not succeed. Failure is formal and gentle: describes someone, sometimes oneself, who missed a goal. Loser is informal and insulting: mocks someone, especially for losing a game. Failure meaning 'an unsuccessful event' is not compared.

这两个词都可以指“失败的人”，但语气和使用场合不同：failure 较为正式、语气也温和一些，多用来描述某人（有时是自称）未能达成目标，不一定带嘲讽意味；loser 是口语化甚至带贬义的说法，常用来嘲笑或侮辱他人，尤其是在比赛或社交场合中显得不成功的人。这里不比较 failure 表示“失败；故障（事件）”的用法。