unnecessary

Word family  noun necessity the necessaries the necessary adjective necessary ≠ unnecessary verb necessitate adverb necessarily ≠ unnecessarily

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++un·ne·ces·sa·ry /ʌnˈnesəsəri $ -seri/ ●●○ adjective  NEED#not needed, or more than is needed 不必要的；多余的unnecessary expense/cost/extravagance etc an unnecessary expense 不必要的支出 There’s no point in taking unnecessary risks. 冒不必要的风险没什么意义。 We can’t afford any unnecessary delays. 我们经不起无谓的耽搁。 Williams was found guilty of causing unnecessary suffering to animals 威廉斯因无故虐待动物被判有罪。 —unnecessarily /ʌnˈnesəsərəli $ ˌʌn-nesəˈserəli/ adverb I don’t want to worry you unnecessarily. 我不想给你增添不必要的烦恼。n COLLOCATIONSadverbstotally/completely/entirely unnecessaryThe suffering of these animals is totally unnecessary.quite unnecessary British English‘I’ll give you a lift.’ ‘Thank you, but that’s quite unnecessary.’nounsunnecessary sufferingShe admitted causing the dog unnecessary suffering.an unnecessary riskNeither team is likely to take any unnecessary risks, so the result will probably be a draw.an unnecessary expense/costHe thinks advertising is an unnecessary expense.an unnecessary extravagance (=something that costs more than is necessary or more than you can afford)The chairman called first-class airline travel an unnecessary extravagance.

Examples from the Corpus

unnecessary• The company is to challenge the conditions imposed by Sefton Council on the grounds that they are unnecessary.• The tendency to categorize black sportsmen and women differently from the rest is faintly racist and, I believe, totally unnecessary.• This does not, of course, imply that nurses should not be concerned with the prevention of unnecessary accidents.• For years, I fended off these touching but unnecessary acts of charity.• We can't afford any unnecessary delays.• Another factor led to frustration, annoyance, and an unnecessary expenditure of about $ 800,000.• It is unnecessary for the purposes of this appeal, to express a conclusion upon them.• The boy jerked them in over the gunwale, his father giving an unnecessary push from underneath.unnecessary suffering• But in Leeds High Court, a vet denied the mink endured unnecessary suffering.• Doctors were unable to treat them unless and until their parents had been traced and this could cause unnecessary suffering.• He had carried out a deliberate act causing unnecessary suffering and cruelty.• He denied two charges of abandoning the pets in circumstances likely to cause them unnecessary suffering on October 23 last year.• They are both accused of fourteen offences of causing unnecessary suffering to animals.• Woodruff admitted causing unnecessary suffering when she appeared before Swindon Magistrates.

un·ne·ces·sa·ry adjective →n COLLOCATIONS1LDOCE OnlineChineseSyllable  

more than needed or needed, is not Corpus

unnecessary
un‧ne‧ces‧sa‧ry /ʌnˈnesəsəri $ -seri/ adjectivenot needed, or more than is needed
    unnecessary expense/cost/extravagance etc
    an unnecessary expense
    There’s no point in taking unnecessary risks.
    We can’t afford any unnecessary delays.
    Williams was found guilty of causing unnecessary suffering to animals
—unnecessarily /ʌnˈnesəsərəli $ ˌʌn-nesəˈserəli/ adverb:
    I don’t want to worry you unnecessarily.
     

COLLOCATIONS

■ adverbs
   ▪ totally/completely/entirely unnecessary The suffering of these animals is totally unnecessary.
   ▪ quite unnecessary British English ‘I’ll give you a lift.’ ‘Thank you, but that’s quite unnecessary.’
■ nouns
   ▪ unnecessary suffering She admitted causing the dog unnecessary suffering.
   ▪ an unnecessary risk Neither team is likely to take any unnecessary risks, so the result will probably be a draw.
   ▪ an unnecessary expense/cost He thinks advertising is an unnecessary expense.
   ▪ an unnecessary extravagance (=something that costs more than is necessary or more than you can afford) The chairman called first-class airline travel an unnecessary extravagance.

🔑 un·neces·saryBrE /ʌnˈnesəsəri/ 🔊NAmE /ʌnˈnesəseri/ 🔊 adjective🔑 not needed; more than is needed 不需要的；不必要的；多余的 SYN unjustified ◆unnecessary expense不必要的花费◆They were found guilty of causing unnecessary suffering to animals. 他们因虐待动物而被判有罪。🔊🔊◆All this fuss is totally unnecessary. 这场纷扰是完全可以避免的。🔊🔊 OPP necessary 🔑 (of remarks, etc. 言语等) not needed in the situation and likely to be offensive 不必要（且容易开罪于人）的 SYN uncalled for ◆That last comment was a little unnecessary, wasn't it? 那最后一点评论有点多余，是吧？🔊🔊▸ un·neces·sar·ily BrE /ˌʌnˈnesəsərəli/ 🔊NAmE /ˌʌnˌnesəˈserəli/ 🔊 adverb◆There's no point worrying him unnecessarily. 没有必要让他过于担心。🔊🔊◆unnecessarily complicated instructions过分复杂的指令