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Foolish or silly, especially in a smug or self-satisfied way: "an era of delicious, fatuous optimism shaped by the belief that enough good will on the part of people like ourselves could repair anything" (Shirley Abbott). See Synonyms at foolish.

[From Latin fatuus.]

fat′u·ous·ly adv.
fat′u·ous·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.fatuously - vacuously or complacently and unconsciously foolish
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[ˈfætjʊəslɪ] ADVneciamente
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


[ˈfætjʊəslɪ] advstupidamente
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in classic literature ?
This time the opportunity presented what he fatuously termed to himself a "cinch." A young woman of a modest and pleasing guise was standing before a show window gazing with sprightly interest at its display of shaving mugs and inkstands, and two yards from the window a large policeman of severe demeanour leaned against a water plug.
She had turned to wave her hand before going into the house, and he was still smiling fatuously. Wonderful girl!
The little girl smiled fatuously, as though I were paying her compliments.
The wife of the "odious person" was witless and fatuously conceited.
Though a dog cannot judge guilt, Rodden fatuously asks "how bad can someone be if .
Finally and shockingly President JR Jayewardene (JRJ) deliberately suborned Gen Denis' command by giving his nephew, his Chief of Staff, an ad hoc appointment bypassing Gen Denis, fatuously 'to wipe out terrorism' by year end in 1979.
Even a fatuously bloviating clock is right twice a day, and in retrospect it's apparent that with this comment, Pence was saying something correct and important.
'The toxic, or the intoxicating, mix helped people like me, who had been in and out of hot seats, join post-retirement the ever-expanding club fatuously called 'the strategic community'.
One might argue, however fatuously, that leadership is genetic and a great leader transfers his leadership genes to his children.
These interventions will not be popular, nor will they be given a definitive stamp of approval by the United Nations, as Corbyn fatuously suggests should happen, since Russia blocks all UN resolutions that run counter to its interests.
"It is regrettable to see an Arab and Islamic country call a seven-decade-old scar on the Islamic world's wounded body a 'side issue' and so fatuously fail to realize the simplest of world affairs, thus embarrassing itself and its people...
Under this fatuously self-defeating regime, the returns have migrated to large conglomerateurs and private-equity players who benefit from perfectly legal insider trading in every one of their investments.