1. (a.) Marked with, or exhibiting, folly; void of understanding; weak in intellect; without judgment or discretion; silly; unwise.

2. (a.) Such as a fool would do; proceeding from weakness of mind or silliness; exhibiting a want of judgment or discretion; as, a foolish act.

3. (a.) Absurd; ridiculous; despicable; contemptible.

Pickwickian absurd airy apish arch asinine batty befooled beguiled bemused besotted beyond belief bizarre blockheaded boneheaded brainless brash buffoonish catchpenny cockamamie cockeyed confused crazy credulous cuckoo daffy daft dazed demented devilish dim dim-witted dippy dizzy dopey doting dotty dull-witted dumb elfish elvish empty empty-headed erratic extravagant fantastic fatuitous fatuous feebleminded flaky flimsy fond fool foolhardy foolheaded fribble fribbling frivolous frothy fuddled full of mischief futile gaga goofy grotesque gulled hasty headless headlong heedless high-flown high-spirited idiotic idle ignorant ill-advised ill-considered illogical imbecile imbecilic impetuous impish impolitic imprudent inane incautious incredible indiscreet inept infatuated injudicious insane insensate irrational knavish kooky lackbrained laughable lean-minded lean-witted light light-headed loony ludicrous mad maudlin mindless mischief-loving mischievous misguided monstrous moronic nonsensical not bright nugacious nugatory numskulled nuts nutty obtuse of little brain otiose outrageous outre pea-brained pin-brained playful poppycockish potty prankish pranksome pranky preposterous puckish rash reasonless reckless ridiculous roguish rubbishy sappy scampish scapegrace scatterbrained screwy senseless sentimental shallow short-sighted silly skimble-skamble slackminded slackwitted slender slight slow-witted sportive stolid stupid superficial thick thickheaded thoughtless trashy trickish tricksy trifling trite trivial twaddling twaddly ungifted unintellectual unintelligent unorthodox unreasonable unreasoning unstable untalented unthinking unwary unwise unwitty vacuous vain vapid wacky waggish weak-minded weird wet wild windy witless