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Phrase(s): a fool’s paradise
Fig. a state of being happy for foolish or unfounded reasons. • I’m afraid that Sue’s marital happiness is a fool’s paradise; there are rumors that her husband is unfaithful. • Fred is confident that he’ll get a big raise this year, but I think he’s living in a fool’s paradise.
McGrawhill's American Idioms And Phrasal Verbs
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State of delusive contentment or false hope. For example, Joan lived in a fool's paradise, looking forward to a promotion she would never get. This expression was first recorded in 1462.
American Heritage Idioms