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TOEFL IELTS BNC: 4667 COCA: 5657
useless
adjective /ˈjuːsləs/
  1. useless objects have no purpose or cannot do what they were designed to do 无用的;无效的

    This technology is useless if you can't operate it. 如果你不能操作这项技术,它就没用了。

    Why do you keep this completely useless umbrella? 你为什么还留着这把毫无用处的雨伞呢?

    prove useless :

    Most of his inventions proved useless. 他的大多数发明证明并无用处。

     Synonyms and related words
    Not effective or useful and not working correctly: useless, ineffective, inefficient...
    1. a.
      useless activities are not effective in achieving the purpose that they were intended to achieve (活动)未达到目的的,没有成效的

      Will's parents think acting is a useless profession. 威尔的父母认为表演是个一无是处的职业。

      it's useless trying to do something :

      It's useless trying to talk to her because she never listens. 想跟她说话是白费口舌,因为她从来就不听。

       Synonyms and related words
      Not effective or useful and not working correctly: useless, ineffective, inefficient...
    2. b.
      if someone is useless, they are not any help to you or are not capable of achieving anything (某人)帮不上忙的,做不成事的,无能的

      Don't ask Geoff – he's useless! 不要问杰夫,他帮不了忙!

      useless at something (=very bad at it) 做某事非常差劲的 :

      I'm useless at cooking. 我的烹调手艺非常差劲。

       Synonyms and related words
      Not effective or useful and not working correctly: useless, ineffective, inefficient...
    3. c.
      a part of your body or mind that is useless cannot be used because of an illness or injury (身体一部分或心智因有病或受到损害而)丧失功能的

      Since the stroke, my left arm has been useless. 中风以来,我的左臂已经丧失了功能。

       Synonyms and related words
      Not effective or useful and not working correctly: useless, ineffective, inefficient...

derived words

uselessly

adverb
 Synonyms and related words
Not effective or useful and not working correctly: useless, ineffective, inefficient...

uselessness

noun [U]
 Synonyms and related words
Disadvantages: disadvantage, handicap, limitation...

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