foolish
Americanadjective
-
resulting from or showing a lack of sense; ill-considered: unwise.
a foolish action;
a foolish speech.
- Synonyms:
- thoughtless, imprudent, preposterous, nonsensical, absurd, ridiculous, unintelligent, senseless, brainless, witless, stupid
-
lacking forethought or caution.
- Synonyms:
- thoughtless, imprudent, incautious, heedless, half-baked, foolhardy, reckless, rash, impetuous
-
trifling, insignificant, or paltry.
adjective
-
unwise; silly
-
resulting from folly or stupidity
-
ridiculous or absurd; not worthy of consideration
-
weak-minded; simple
-
an archaic word for insignificant
Usage
What are other ways to say foolish? A foolish action is one that shows a lack of sense or is ill-considered. How is foolish different from fatuous, silly, inane, stupid, and asinine? Find out on Thesaurus.com.
Other Word Forms
Etymology
Origin of foolish
First recorded in 1250–1300; from Middle English folish, foolish; see fool 1, -ish 1
Explanation
Foolish people are silly or senseless, and when you do something foolish, it's clearly unwise or irrational. Sitting on the hood of a car while your friend is driving is a foolish thing to do. Things that show a lack of judgment are foolish, like cheating on a test or running into the street after a basketball. Foolish decisions at work can cost you your job, and foolish comments can hurt people's feelings. Foolish is a 14th century word that comes from fool, a person who's unwise. The Latin root, follis, means "bellows" or "leather bag." The "silly person" meaning comes from the figurative idea of a "windbag."
Vocabulary lists containing foolish
Negative Words to Describe People
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
Florida's B.E.S.T. Common Suffixes: -ish
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
"The Open Window" and "One in a Million"
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
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.
It does mean a history of generally good judgment, in which foolish acts are the exception rather than the rule.
From Slate ● Jul. 7, 2026
A Sky-ITV company would be foolish to pivot away from commissioning programmes with a national identity.
From BBC ● Jul. 4, 2026
Law firms mint millionaires who do nothing but foolish errands.
From The Wall Street Journal ● Jul. 2, 2026
“It would be foolish to tell a family that they don’t have access to the pediatrician or the family doc.”
From Los Angeles Times ● Jun. 26, 2026
Aaron and Coal looked at each other, but neither of them were foolish enough to make a comment.
From "Boy 2.0" by Tracey Baptiste
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.