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fatuous

[fach-oo-uh s] /ˈfætʃ u əs/
adjective
1.
foolish or inane, especially in an unconscious, complacent manner; silly.
2.
unreal; illusory.
Origin
1625-1635
1625-35; < Latin fatuus silly, foolish, idiotic; see -ous
Related forms
fatuously, adverb
fatuousness, noun
Synonyms
1. dense, dull, dim-witted. See foolish.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for fatuousness

fatuous

/ˈfætjʊəs/
adjective
1.
complacently or inanely foolish
Derived Forms
fatuously, adverb
fatuousness, noun
Word Origin
C17: from Latin fatuus; related to fatiscere to gape
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for fatuousness
adjective

illusory; delusive

Word Origin

Latin fatuus 'foolish'

Dictionary.com's 21st Century Lexicon
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Word Origin and History for fatuousness

fatuous

adj.

c.1600, from Latin fatuus "foolish, insipid, silly;" of uncertain origin (Buck suggests originally "stricken" in the head). Related: Fatuously; fatuousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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14
17
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