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fixed idea

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noun
a persistent or obsessing idea, often delusional, that can, in extreme form, be a symptom of psychosis.
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Origin of fixed idea

First recorded in 1820–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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British Dictionary definitions for fixed idea

fixed idea

noun
an idea, esp one of an obsessional nature, that is persistently maintained and not subject to changeAlso: idée fixe
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
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