Definition of foolishness in English:

foolishness

noun

  • Lack of good sense or judgment; stupidity.

    ‘she was realizing the foolishness of her actions’
    • ‘She prefers to take her time and to enjoy Harry's foolishness, watching from a distance, and that's exactly what she did.’
    • ‘Galton was confident the figures would confirm his view of popular foolishness.’
    • ‘For all its foolishness, though, the Midas myth contains neither death nor destruction.’
    • ‘The inevitable thoughts of his foolishness returned to him, no matter, how optimistic he tried to be.’
    • ‘To try to distil it through some intellectual process is foolishness.’
    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

/ˈfo͞oliSHnəs//ˈfulɪʃnəs/