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irrational

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adjective British English pronunciation: irrational /ɪˈræʃ(ə)nəl/
  1. done or happening without clear or sensible reasons

    irrational violence/fear/panic

    The market's enthusiasm for high-tech stocks was irrational but understandable.

    1. a.
      not thinking or behaving in a clear reasonable way

      I knew I was being irrational, but when she was late I began to fear the worst.

derived words

irrationality

 British English pronunciation: irrationality /ɪˌræʃəˈnæləti/  noun [uncountable]

irrationally

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