a state of enjoyment based on false beliefs or hopes; a state of illusory happiness.
Origin of fool's paradise
late Middle English word dating back to 1425–75
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.