fixed idea
noun
a persistent or obsessing idea, often delusional, that can, in extreme form, be a symptom of psychosis.
Origin of fixed idea
First recorded in 1820–30
Words nearby fixed idea
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 change
Also: idée fixe
Medical definitions for fixed idea
fixed idea
n.
An often unreasonable idea or feeling that persists despite evidence to the contrary or efforts to ignore it; an obsession.
idée fixe