fool's paradise

fool's paradise idiom
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.

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