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BNC: 8527 COCA: 8231
irrational
adjective /ɪˈræʃ(ə)nəl/
  1. done or happening without clear or sensible reasons 没有理性的；不理智的

    irrational violence/fear/panic 没有理性的暴行/恐惧/恐慌

    The market's enthusiasm for high-tech stocks was irrational but understandable. 市场对高科技股的热情虽然不理性，却是可以理解的。

     Synonyms and related words
    Not sensible or reasonable: unreasonable, wrong, extreme...
    1. a.
      not thinking or behaving in a clear reasonable way 不理智的；荒谬的

      I knew I was being irrational, but when she was late I began to fear the worst. 我知道自己有些不理智，但当她迟到时我就开始害怕最糟糕的事情会发生。

       Synonyms and related words
      Not sensible or reasonable: unreasonable, wrong, extreme...

derived words

irrationality

/ɪˌræʃəˈnæləti/ noun [U]
 Synonyms and related words
Stupid ideas or behaviour: stupidity, madness, lunacy...

irrationally

adverb
 Synonyms and related words
Not sensible or reasonable: unreasonable, wrong, extreme...
BNC: 8527 COCA: 8231
irrational

adjective

VERBS | ADVERB VERBS➤appear, be, seem顯得不理性；不合理；似乎失去理性▸➤become變得不理性▸➤consider sth, regard sth as, see sth as認為⋯不合理▸➤dismiss sth as認為⋯不合理而不加考慮◇He dismissed her fears as irrational.他認為她的恐懼毫無道理而未加理睬。ADVERB➤completely, quite, totally, wholly完全不合理；十分不合理；毫無道理▸➤increasingly越來越不合理▸➤somewhat有些不理性▸➤apparently, seemingly表面上／貌似不合理➤inherently根本不合理◇There was nothing inherently irrational in such a decision.從根本上看，這樣的決定沒什麼不合理的地方。
BNC: 8527 COCA: 8231
irrational

adjective

  ➡ See also the entries for unjustified and unofficial 另见unjustified条和unofficial条irrational ♦︎ illogical ♦︎ unfounded ♦︎ groundless ♦︎ unconfirmed ♦︎ unsubstantiated ♦︎ unsupported ♦︎ unscientificThese words all describe things that are not based on any good reason or evidence. 这些词均表示无理由的、无根据的、未经证实的。PATTERNS AND COLLOCATIONS 句型和搭配◆an irrational / illogical fear◆an unfounded / a groundless / an unsubstantiated / an unsupported claim / allegation / assertion◆an unfounded / a groundless / an unsubstantiated accusation / charge◆an unfounded / an unconfirmed / an unsubstantiated rumour◆an unfounded / unconfirmed / unsubstantiated story / report◆totally irrational / illogical / unfounded / groundless / unsubstantiated / unsupported / unscientific◆completely irrational / unfounded / groundless / unsubstantiated / unsupported◆largely unfounded / groundless / unsupported■ irrational ɪˈræʃənl not based on, or not using, clear logical thought 不合逻辑的；没有道理的◆These are just irrational fears.这些只是无端的恐惧。◆You're being irrational.你不可理喻。OPP rational ⇨ rational ▸ irrationally

adverb

◆to behave irrationally表现得没有理性■ illogical ɪˈlɒdʒɪkl; NAmE ɪˈlɑːdʒɪklnot sensible or thought out in a logical way 悖理的；不合逻辑的◆From all this evidence he drew a strange and illogical conclusion.仅凭这条证据，他竟得出了一个奇怪的、不合情理的结论。 OPP logical ⇨ rational ▸ illogically

adverb

◆He felt illogically that somehow he was responsible for the disaster.他无端地觉得他就该为这场灾难负责。NOTE 辨析 Irrational or illogical?In some cases you can use either word. 在有些情况下这两个词可以通用◆an irrational / illogical fear of insects对昆虫的无端恐惧 Irrational emphasizes that there is no good reason for sth; illogical suggests that sb has used a false line of reasoning from facts that do not in fact support their reasoning. A person can be irrational but not 'be illogical'. * irrational强调某事没有充分的理由，illogical意指没有道理或证据不充分。可以说sb is irrational，但不能说sb is illogical◆You're being illogical. ■ unfounded not based on fact or any good reason 无端的；没理由的；莫须有的◆I was pleased to discover that my fears were unfounded.发现自己的担忧毫无道理，我很高兴。◆I dismissed the story as unfounded speculation.我认为这种说法纯属无稽之谈。■ groundless not based on any good reason 无理由的；无根据的◆Most of his worries proved to be groundless.他的大部分忧虑证明是毫无道理的。◆They denied what they called completely groundless allegations.他们否认了他们称之为毫无根据的指控。NOTE 辨析 Unfounded or groundless?In many cases you can use either word. 在许多情况下这两个词可以通用◆unfounded / groundless claims / allegations / accusations / fears / worries毫无根据的说法／指控／控告／担心／忧虑However, groundless is not used to talk about things that ought to be based on fact rather than reasons. 不过，groundless指没有理由，不指没有事实依据◆groundless stories/reports/rumours/speculation ■ unconfirmed that has not yet been proved to be true 未经证实的◆Unconfirmed reports stated that at least six people had died.未经证实的报道称至少有六人丧生。■ unsubstantiated ˌʌnsəbˈstænʃieɪtɪd (formal) not proved to be true by evidence 未经证实的◆There were unsubstantiated rumours of abuse at the prison.未经证实的传言称监狱里存在虐待行为。■ unsupported not proved to be true by evidence 未经证实的◆Their claims are unsupported by any research findings.他们的说法并未得到任何研究结果的证实。NOTE 辨析 Unsubstantiated or unsupported?There is no real difference in meaning between these words. Unsubstantiated is more formal and is more often used before a noun; unsupported is more often used after a linking verb in the phrase sth is unsupported by the evidence/findings, etc. 这两个词在含义上没有实质差别。unsubstantiated较正式，多用在名词前；unsupported多用在sth is unsupported by the evidence/findings等短语中。■ unscientific (often disapproving) not done in a careful, logical way, according to scientific principles 不科学的；非科学的；违背科学方法的◆Their approach to the problem was very unscientific.他们解决问题的方式很不科学。 OPP scientific ⇨ rational

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