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fixed idea

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noun
  1. 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. 2018

British Dictionary definitions for fixed idea

fixed idea

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

fixed idea in Medicine

fixed idea

n.
  1. An often unreasonable idea or feeling that persists despite evidence to the contrary or efforts to ignore it; an obsession.idée fixe
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.