Definition of bêtise in English:

bêtise

noun

  • A foolish or ill-timed remark or action.

    ‘in spite of her bêtise about striped suits he saw her point of view’
    • ‘(Nanfang Daily) Yet another piece of bêtise: A plastic goods factory took advantage of the summer vacation to hire youth workers, including many of whom are under 16 years old.’
    • ‘Here are examples of what we call ‘faire des bêtises’ in French.’
    • ‘This is a special issue on bêtises d' enfance (childhood high jinks, goof ups and silly mistakes).’

Origin

French, stupidity, from bête foolish.

Pronunciation:

bêtise

/French betiz//bɛˈtiːz//beɪˈtiːz/