WordReference Random House Unabridged Dictionary of American English © 2026
fixed′ ide′a, 
  1. a persistent or obsessing idea, often delusional, that can, in extreme form, be a symptom of psychosis.
  • 1820–30

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'fixed idea' also found in these entries (note: many are not synonyms or translations):
hobbyhorse - idée fixe - complex

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