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[fa-stid-ee-uh s, fuh-] /fæˈstɪd i əs, fə-/
excessively particular, critical, or demanding; hard to please:
a fastidious eater.
requiring or characterized by excessive care or delicacy; painstaking.
Origin of fastidious
late Middle English
1375-1425; late Middle English < Latin fastīdiōsus squeamish, equivalent to fastīdi(um) lack of appetite, disgust, perhaps by syncope of *fastutīdium (fastu-, combining form of fastus pride, conceit + -tīdium combining form of taedium tedium) + -ōsus -ous
Related forms
fastidiously, adverb
fastidiousness, noun
hyperfastidious, adjective
hyperfastidiously, adverb
hyperfastidiousness, noun
nonfastidious, adjective
nonfastidiously, adverb
nonfastidiousness, noun
overfastidious, adjective
overfastidiously, adverb
overfastidiousness, noun
ultrafastidious, adjective
ultrafastidiously, adverb
ultrafastidiousness, noun
unfastidious, adjective
unfastidiously, adverb
unfastidiousness, noun
1. See particular. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for fastidiously
Contemporary Examples
Historical Examples
  • There are great emergencies in which we do not fastidiously choose our words.

    A Handful of Stars Frank W. Boreham
  • Fastidious as he was in all things, he was fastidiously deferential.

  • He was not so fastidiously exact about killing his man by inches.

  • "I suggest we adjourn to the commissary," Martin said fastidiously.

    The Ego Machine Henry Kuttner
  • It's really a very comfortable way of traveling about and the wagon was fastidiously fitted up by my distinguished predecessor.

    Diane of the Green Van Leona Dalrymple
British Dictionary definitions for fastidiously


very critical; hard to please
excessively particular about details
exceedingly delicate; easily disgusted
Derived Forms
fastidiously, adverb
fastidiousness, noun
Word Origin
C15: from Latin fastīdiōsus scornful, from fastīdium loathing, from fastus pride + taedium weariness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fastidiously



mid-15c., "full of pride," from Latin fastidiosus "disdainful, squeamish, exacting," from fastidium "loathing, squeamishness," most likely from *fastu-taidiom, a compound of fastus "contempt, arrogance" and taedium "aversion, disgust." Early use in English was both in passive and active senses. Meaning "squeamish, over-nice" emerged in English 1610s. Related: Fastidiously; fastidiousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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fastidiously in Medicine

fastidious fas·tid·i·ous (fā-stĭd'ē-əs, fə-)

  1. Possessing or displaying careful, meticulous attention to detail.

  2. Difficult to please; exacting.

  3. Having complex nutritional requirements. Used of microorganisms.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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