Dictionary.com
Thesaurus.com
Synonyms

fixed idea

American  

noun

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


fixed idea British  

noun

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

"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

Etymology

Origin of fixed idea

First recorded in 1820–30

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Vallejo also dedicated three summers to the caddie program, getting up early, enduring the heat and carrying heavy bags, always with a fixed idea in mind.

From Los Angeles Times May 28, 2025

Getting a new view on someone I had such a fixed idea of who or want he was, and this is a way of understanding that.

From Salon Jul. 6, 2023

But “love of my life” is a fixed idea, and people are fluid, updating themselves over time.

From Washington Post Jan. 10, 2023

Coalition 18 has no fixed idea of what form its organizing should take.

From New York Times Nov. 18, 2021

R. M. Renfield, ætat 59.—Sanguine temperament; great physical strength; morbidly excitable; periods of gloom, ending in some fixed idea which I cannot make out.

From "Dracula" by Bram Stoker

Vocabulary.com logo
by dictionary.com

Dictionary.com's Learning Companion

Go beyond just looking up words.
Remember them forever with VocabTrainer.

Start training