WordReference Random House Unabridged Dictionary of American English © 2020
bê•tise  (be tēz),USA pronunciation n. 
  1. lack of understanding, perception, or the like;
    stupidity.
  2. a stupid or foolish act or remark.
  3. something inconsequential or without merit;
    absurdity;
    trifle.
  • French: literally, foolishness, equivalent. to bête foolish (see beast) + -ise -ice
  • 1820–30

'bêtise' also found in these entries (note: many are not synonyms or translations):
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