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a fool's paradise
A happy state that one inhabits for foolish, unfounded, or delusional reasons. We were living in a fool's paradise thinking that the financial successes of the early 2000s would last forever.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
fool's paradise, a
Bliss based on illusion, ignorance, or misunderstanding. The expression dates from the fifteenth century, when it appeared in print in William Paston’s letters (1462: “I wold not be in a folis paradyce”). It recurs again and again, in numerous sixteenth-century sources (including Pettie, Lyly, and Shakespeare), and was certainly a cliché by the time George Bernard Shaw wrote, “Beguiling tedious hours with romances and fairy tales and fools’ paradises” (Misalliance, 1910).
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer