Thesaurus.com
Dictionary.com
Showing results for foolish. Search instead for foolish/2.
Definitions

foolish

[foo-lish] / ˈfu lɪʃ /
ADJECTIVE
nonsensical, idiotic
Synonyms
STRONGEST
absurd crazy fantastic ill-advised insane irrational ludicrous preposterous ridiculous silly stupid unreasonable unwise
WEAK
asinine brainless cockamamy daffy daft dippy doltish dotty fatuous feebleminded half-baked half-witted harebrained ill-considered imbecilic imprudent incautious indiscreet injudicious jerky kooky loony lunatic mad moronic nutty senseless short-sighted simple unintelligent wacky weak witless zany
Antonyms
STRONGEST
balanced logical plain practical rational realistic reasonable responsible sane sensible serious smart sound wise
WEAK
careful cautious circumspect prudent thoughtful unfoolish

Usage

What are other ways to say foolish? The adjective foolish implies a lack of common sense or good judgment or, sometimes, a weakness of mind: a foolish decision; The child seems foolish. Fatuous implies being not only foolish, dull, and vacant in mind, but complacent and highly self-satisfied as well: fatuous and self-important; fatuous answers. Silly denotes extreme and conspicuous foolishness; it may also refer to pointlessness of jokes, remarks, etc.: silly and senseless behavior; a perfectly silly statement. Inane applies to silliness that is notably lacking in content, sense, or point: inane questions that leave one with no reply. Stupid implies natural slowness or dullness of intellect, or, sometimes, a benumbed or dazed state of mind; it is also used to mean foolish or silly: He was rendered stupid by a blow; It is stupid to do such a thing. Asinine originally meant like an ass; it applies to witlessly stupid conversations or conduct and suggests a lack of social grace or perception: He failed to notice the reaction to his asinine remarks.

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.

Go through the account activity together, framing it as a routine check rather than accusing him of being foolish or incompetent.

From MarketWatch • Mar. 23, 2026

He said Iran had been “very foolish, very stupid” when it attacked its neighbors, hurting its own chances of success in resisting the U.S.

From Los Angeles Times • Mar. 9, 2026

It would be foolish to make confident predictions about what will happen in this war, except to say that nearly all potential outcomes are likely to create much bigger problems down the road.

From Salon • Mar. 8, 2026

The teens who are out riding on golf courses and such are "foolish and it's ruining the whole usage of e-bikes for everyone else."

From BBC • Mar. 6, 2026

The voice belonged to a boy, and only one boy would be foolish enough to call her name in the same woods that held a dragon and a murderous Varangian.

From Anya and the Dragon by Sofiya Pasternack

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.