[ 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.

Nearby words

  1. fastball,
  2. fasten,
  3. fastener,
  4. fastening,
  5. faster,
  6. fastidiously,
  7. fastie,
  8. fastigiate,
  9. fastigium,
  10. fasting

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 forms

Synonym study

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

British Dictionary definitions for non-fastidious


/ (fæˈstɪdɪəs) /


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 non-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 non-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.