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

    This technology is useless if you can't operate it. 如果你不能操作這項技術，它就沒用了。

    Why do you keep this completely useless umbrella? 你爲什麽還留着這把毫無用處的雨傘呢？

    prove useless :

    Most of his inventions proved useless. 他的大多數發明證明並無用處。

     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 （活動）未達到目的的，沒有成效的

      Will's parents think acting is a useless profession. 威爾的父母認爲表演是個一無是處的職業。

      it's useless trying to do something :

      It's useless trying to talk to her because she never listens. 想跟她說話是白費口舌，因爲她從來就不聽。

       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）幫不上忙的，做不成事的，無能的

      Don't ask Geoff – he's useless! 不要問傑夫，他幫不了忙！

      useless at something (=very bad at it) 做某事非常差勁的 :

      I'm useless at cooking. 我的烹調手藝非常差勁。

       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 （身體一部分或心智因有病或受到損害而）喪失功能的

      Since the stroke, my left arm has been useless. 中風以來，我的左臂已經喪失了功能。

       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...
TOEFL IELTS BNC: 4667 COCA: 5657
useless

adjective¹

 1of no use無用VERBS | ADVERB | PREPOSITION VERBS➤be, feel, prove無用；感到徒勞；證明無用◇Her efforts to avoid him proved useless.她怎麼也躲不開他。➤become變得無用▸➤leave sth, make sth, render sth使⋯無用◇The condition rendered her legs virtually useless.這種病使她的雙腿幾乎喪失了功能。ADVERB➤absolutely, completely, entirely, quite, totally, utterly, wholly (especially BrE) 毫無用處；完全用不上▸➤worse than幫倒忙◇A computer program with too many icons is worse than useless.一個圖標太多的計算機程序還不如沒有。➤all but, almost, nearly, practically, virtually差不多無用；實際上無用▸➤largely, mostly基本上無用➤basically, essentially根本無用▸➤fairly, pretty, rather相當無用➤seemingly好像無用▸➤equally同樣無用◇There are two manuals, both of them equally useless.有兩本說明書，都沒有什麼用處。PREPOSITION➤as作為⋯沒有用◇A candle is practically useless as a light source.以蠟燭作為光源實際上沒什麼用。➤for對⋯沒有用◇The land is useless for cattle.這塊地養牛可不行。➤in在⋯方面無效◇This drug is useless in the treatment of patients with AIDS.這種藥對艾滋病患者毫無療效。➤to對⋯無用◇The information was useless to him.這一信息對他毫無用處。
useless

adjective²

 2 (informal) weak/not successful差勁；無能VERBS | ADVERB | PREPOSITION VERBS➤be差勁ADVERB➤absolutely, completely差勁透頂；一無是處▸➤pretty很差勁PREPOSITION➤at不擅長⋯◇I'm pretty useless at this job.這種工作我一竅不通。
TOEFL IELTS BNC: 4667 COCA: 5657
useless adj.
⇨ useless (useless to protest) ⇨ incompetent (useless at French) useless

adjective

useless ♦︎ in vain ♦︎ pointless ♦︎ futile ♦︎ hopeless ♦︎ fruitless ♦︎ vain ♦︎ unusableThese words all describe sth which has no purpose or does not achieve what you want. 這些詞均表示無用的、無效的、徒勞的。PATTERNS AND COLLOCATIONS 句型和搭配◆to be useless / pointless / futile / hopeless / fruitless / vain to do sth◆to be useless / pointless doing sth◆a useless / pointless / futile / fruitless exercise◆a futile / hopeless / fruitless / vain attempt◆a futile / fruitless / vain effort◆a hopeless / fruitless / vain task◆a futile / hopeless / fruitless / vain search◆largely useless / in vain / pointless / futile / hopeless / fruitless / vain◆seemingly useless / in vain / pointless / futile / hopeless◆completely useless / pointless / futile / hopeless / unusable◆utterly useless / pointless / futile / hopeless■ useless not useful; not doing or achieving what is needed or wanted 無用的；無效的；無價值的◆This pen is useless.這支筆沒用了。◆He knew it was useless to protest.他知道抗議是徒勞的。◆It's useless worrying about it.爲這事擔心無濟於事。◆The letter is useless as evidence.這封信作爲證據毫無價值。◆The land is useless for cattle.這塊地根本不能用來牧牛。◆The drug is useless in the treatment of patients with AIDS.這種藥對治療艾滋病人無效。◆The information was useless to him.這條信息對他來說沒有價值。◆The quality ranged from acceptable to worse than useless.質量從尚可到非常糟糕不等。OPP useful ⇨ useful , valuable ⇨ valuable 2 ▸ uselessly

adverb

◆The sail flapped uselessly.帆擺動着，卻不起作用。■ in ˈvain

idiom

 (written) not achieving what is needed or wanted; without success 徒勞無功；白費力氣◆All their efforts were in vain.他們的所有努力都付諸東流了。◆They tried in vain to persuade her to go.他們極力勸說她去，但枉費了一番口舌。◆She waited in vain for her son to return.她等着兒子歸來，但空等了一場。■ pointless having no purpose; not worth doing because there is no hope of success 無意義的；無目標的；不值得做的◆Trying to foresee the future is a pointless exercise.試圖預測未來是毫無意義的事。◆It would be pointless for both of you to work on the same thing.你們倆做同一件事是毫無意義的。◆I knew it was pointless expecting him to change his mind.我知道指望他改變主意是徒勞的。OPP worthwhile ⇨ valuable 2 ▸ pointlessly

adverb

◆He would argue pointlessly with his parents.他會無謂地和父母爭論。■ futile ˈfjuːtaɪl; NAmE ˈfjuːtl (rather formal) ending in failure; having no effect or purpose 徒然的；徒勞的；無效的◆It was a futile gesture as the real damage had already been done.都已經造成真正的傷害了，做出那種姿態也是枉然。◆Their efforts to revive him were futile.他們努力使他蘇醒，但失敗了。▸ futility fjuːˈtɪləti

noun

 [uncountable] ◆a sense of futility徒勞感◆the futility of war戰爭的徒然無益■ hopeless with no hope of success, improvement or of producing useful results 沒有成功（或改善）希望的；無望的◆It's hopeless trying to convince her.想說服她簡直是徒勞。◆Most students are making good progress, but Michael is a hopeless case.大多數學生都很有進步，唯有邁克爾不可救藥。OPP hopeful ⇨ promising ■ fruitless (rather formal) producing no useful results 沒有成果的；無成效的；徒然的◆He returned home after weeks of fruitless negotiations.他在進行了數星期毫無成果的談判後回家了。◆The search proved fruitless.搜查最後只是徒勞。OPP fruitful ⇨ productive ■ vain [usually before noun] (written) not producing the result you want 徒勞的；枉然的；無結果的◆I knocked loudly in the vain hope that someone might answer.我敲門敲得很響，希望有人應聲，卻是徒然。■ unusable ˌʌnˈjuːzəbl [not usually before noun] in such a bad condition or of such low quality that it cannot be used （破得或差得）不能使用，破爛不堪◆The damage rendered the building unusable.這次破壞使得這棟建築已無法使用。◆The plutonium is unusable for anything until it is reprocessed.钚這種物質需要經過處理後方可使用。OPP usable ⇨ useful

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