fixed idea

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fixed idea

n
an idea, esp one of an obsessional nature, that is persistently maintained and not subject to change. Also: idée fixe

i•dée fixe

(i deɪ ˈfiks)
n.

pl. i•dées fixes (i deɪ ˈfiks)
a persistent or obsessing idea, often delusional, that in extreme form can be a symptom of psychosis. Also called fixed idea.
References in periodicals archive ?
The DSM-IV defines an overvalued idea as "an unreasonable and sustained belief that is maintained with less than delusional intensity.
It is often difficult to distinguish between a delusion and an overvalued idea (in which case the individual has an unreasonable belief or idea but does not hold it as firmly as is the case with a delusion).