Definition of foolishness in English:

foolishness

noun

mass noun
  • Lack of good sense or judgement; stupidity.

    ‘she was realizing the foolishness of her actions’
    • ‘The inevitable thoughts of his foolishness returned to him, no matter, how optimistic he tried to be.’
    • ‘For all its foolishness, though, the Midas myth contains neither death nor destruction.’
    • ‘To try to distil it through some intellectual process is foolishness.’
    • ‘Galton was confident the figures would confirm his view of popular foolishness.’
    • ‘She prefers to take her time and to enjoy Harry's foolishness, watching from a distance, and that's exactly what she did.’
    folly, foolhardiness, stupidity, idiocy, imbecility, silliness, inanity, lunacy, madness, rashness, recklessness, imprudence, injudiciousness, lack of caution, lack of foresight, lack of sense, irrationality, illogicality, irresponsibility, thoughtlessness, indiscretion
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Pronunciation

foolishness

/ˈfuːlɪʃnəs/