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Definition 2024

fatuously ‎(comparative more fatuously, superlative most fatuously)

With smug stupidity or vacuous silliness; idiotically.
- 1835, Michael Ryan (ed.), "Reform in the College of Physicians", London Medical and Surgical Journal, Vol. VII, G. Henderson, 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?