foolishness

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."

Definitions of foolishness
1

n the quality of being rash and foolish

“adjusting to an insane society is total foolishness
Synonyms:
craziness, folly, madness
Type of:
stupidity
a poor ability to understand or to profit from experience

n the trait of acting stupidly or rashly

Synonyms:
folly, unwiseness
Antonyms:
wisdom, wiseness
the trait of utilizing knowledge and experience with common sense and insight
Types:
indiscretion, injudiciousness
the trait of being injudicious
absurdity, fatuity, fatuousness, silliness
a ludicrous folly
asininity
the quality of being asinine; stupidity combined with stubbornness
Type of:
trait
a distinguishing feature of your personal nature

n a stupid mistake

Synonyms:
betise, folly, imbecility, stupidity
Type of:
error, fault, mistake
a wrong action attributable to bad judgment or ignorance or inattention

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