Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adv. With smug stupidity or vacuous silliness; idiotically.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adv. vacuously or complacently and unconsciously foolish

Etymologies

fatuous +‎ -ly (Wiktionary)

Examples

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