foolishness
Americannoun
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lack of wisdom or good judgment; foolish quality.
Oh, the foolishness of thinking that wealth brings happiness!
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foolish talk, ideas, or behavior.
How could someone with such a clever mind as yourself talk such foolishness?
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a foolish act, error, habit, etc..
Shakespeare, who looks at all men as if from Mount Olympus, notes their foibles and foolishnesses, and yet smiles on them all.
Other Word Forms
Etymology
Origin of foolishness
Explanation
Foolishness is nonsense or stupidity; it's acting in a way that is silly or irrational. Throwing a temper tantrum because the lunch line is moving slowly is pure foolishness — your outburst won't make the line move any faster. When your actions show a lack of good sense or solid judgement, you're betraying your foolishness. Impulsively jumping off the garage roof into a pile of leaves is evidence of your foolishness. We can trace this word's origin back to fool and the Old French fol, "idiot," and also "blacksmith's bellows," from a root meaning "blow or swell."
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.
In September, Digga D called out the viral 'UK Poo' trend, which saw a wave of tracks blowing up on TikTok defined by what he described as "foolishness".
From BBC ● Nov. 7, 2026
Like Mr. Platner, Mr. Duke claimed to have left all that youthful foolishness behind him.
From The Wall Street Journal ● Jun. 28, 2026
Still, foolishness can sometimes bring good results; there are good results here, and some less than good.
From Los Angeles Times ● May 8, 2026
Diomande's act of foolishness just put the tin hat on it.
From BBC ● Sep. 25, 2025
“Some foolishness nobody never gonna feel like reading. Now him and that Myrna writing insults to each other. Ignatius is telling me he’s gonna get that girl good. Ain't that awful? Poor Myrna.”
From "A Confederacy of Dunces" by John Kennedy Toole
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
