[fa-stid-ee-uh s, fuh-]


excessively particular, critical, or demanding; hard to please: a fastidious eater.
requiring or characterized by excessive care or delicacy; painstaking.

Origin of fastidious

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 formsfas·tid·i·ous·ly, adverbfas·tid·i·ous·ness, nounhy·per·fas·tid·i·ous, adjectivehy·per·fas·tid·i·ous·ly, adverbhy·per·fas·tid·i·ous·ness, nounnon·fas·tid·i·ous, adjectivenon·fas·tid·i·ous·ly, adverbnon·fas·tid·i·ous·ness, nouno·ver·fas·tid·i·ous, adjectiveo·ver·fas·tid·i·ous·ly, adverbo·ver·fas·tid·i·ous·ness, nounul·tra·fas·tid·i·ous, adjectiveul·tra·fas·tid·i·ous·ly, adverbul·tra·fas·tid·i·ous·ness, nounun·fas·tid·i·ous, adjectiveun·fas·tid·i·ous·ly, adverbun·fas·tid·i·ous·ness, noun

Synonym study

1. See particular. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fastidious

Contemporary Examples of fastidious

Historical Examples of fastidious

  • We are about of a size, and I think I shall be able to meet your most fastidious taste.

  • To say my fastidious relatives want me to go home, which would mean leaving you behind.

  • There are many people whose taste in fiction is so fastidious that the sight of dialect in a novel makes them refuse to read it.

    Why we should read

    S. P. B. Mais

  • His mother, a beautiful and fastidious woman, who lived in luxury, left him a penniless orphan of sixteen.

    Repertory Of The Comedie Humaine, Complete, A -- Z

    Anatole Cerfberr and Jules Franois Christophe

  • Fortunately there was no grossness, no clownishness of behavior, which would have irreparably offended his fastidious taste.

    Rose Charlitte

    Marshall Saunders

British Dictionary definitions for fastidious



very critical; hard to please
excessively particular about details
exceedingly delicate; easily disgusted
Derived Formsfastidiously, adverbfastidiousness, noun

Word Origin for fastidious

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

Word Origin and History for fastidious

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

Medicine definitions for fastidious


[fă-stĭdē-əs, fə-]


Possessing or displaying careful, meticulous attention to detail.
Difficult to please; exacting.
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.