fatuous

American  

[fach-oo-uhs] / ˈfætʃ u əs /

adjective

1. foolish or inane, especially in an unconscious, complacent manner; silly; witless.

   Synonyms:

   dull-witted, dull, dense, dim, brainless

2. Archaic. unreal; illusory.

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fatuous British  

/ ˈfætjʊəs /

adjective

1. complacently or inanely foolish

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Usage

What are other ways to say fatuous? The adjective fatuous describes people or things that are foolish or inane, especially in an unconscious, complacent manner. Do you know when to use fatuous, foolish, silly, inane, stupid, and asinine? Find out on Thesaurus.com.

Other Word Forms

• fatuously adverb
• fatuousness noun

Etymology

Origin of fatuous

First recorded in 1625–35; from Latin fatuus “silly, foolish, idiotic”; see -ous

Explanation

Fatuous means lacking intelligence. When your mother outlaws calling your brother stupid, use fatuous instead. Fatuous derives from the Latin fatuus meaning "foolish." It sounds like it should have something to do with being fat, but it actually has no relation to size. Fatuus itself comes from a root that also gave us "debate" and this might be a good way to remember it. You want to debate someone who's fatuous, because they are unintelligent, silly and even a bit conceited, so they probably won't be very persuasive debaters. Just don't call them fatuous to their face. Even if they don't know what it means, it's just not nice!

Example Sentences

The concept is simple but wildly effective, with enough force to push the viewer past many of the film’s fatuous elements.

From Salon • Mar. 15, 2026

But at least they made an attempt, however fatuous, to persuade the American people and the country’s international allies that there was a reason for doing so.

From Salon • Feb. 24, 2026

Visually epic, sonically relentless and otherwise fatuous, the film has a dramatic inertia occasionally punctuated by eruptions of utter catastrophe—a series of shocks that leaves you singed, shaken and not much better for it.

From The Wall Street Journal • Nov. 13, 2025

Not buying that fatuous distinction, Muriel, whom Molaskey handily makes the most complex character among a crowd of cartoons, offers a rebuttal in what may be the only ode to fact-checking ever written.

From New York Times • Feb. 6, 2024

I wish I could remember more of what was said that day—actually, I do remember much of what I said, most of it too fatuous for me to recall with pleasure.

From "The Secret History" by Donna Tartt