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Etymology edit

fatuous +‎ -ly

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Adverb edit

fatuously (comparative more fatuously, superlative most fatuously)

  1. With smug stupidity or vacuous silliness; idiotically.
    • 1835, “Reform in the College of Physicians”, in Michael Ryan, editor, London Medical and Surgical Journal, Vol. VII[1], page 153:
      Will they, like the fellows, judiciously bear a hand in sweeping the stable, or will they fatuously wait to be themselves swept with a besom of destruction?

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