英汉词典

1. 无价值的;不值钱的;没用处的
    Something that is worthless is of no real value or use.

    e.g. The guarantee could be worthless if the firm goes out of business...
           如果厂家倒闭，保修单就会变得毫无用处。
    e.g. Training is worthless unless there is proof that it works.
           除非能证明训练有效，否则就是白搭。

2. 一无是处的；不中用的
    Someone who is described as worthless is considered to have no good qualities or skills.

    e.g. You feel you really are completely worthless and unlovable.
           你会觉得自己真是毫无价值，一点也不讨人喜欢。