Check out new words added to


[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.
Cite This Source
Examples from the web for fastidious
  • fastidious about facts and dates, he talks at great speed and with an unusual, exhausting intensity.
  • It was written to please its author's fastidious taste, not to chime with the humour of the age.
  • He was not a play-goer, being of such fastidious taste that he was easily disgusted by the bad filling up of the inferior parts.
  • Within the fastidious world of opera fans, one group deserves special mention.
  • At first sight this may appear to be unnecessarily fastidious.
  • First, it is so well written and meticulously researched that despite its fastidious attention to detail it is a pleasure to read.
  • Even at the less extreme camps, security procedures remain fastidious.
  • He, who had always been so fastidious in dress, no longer seemed to care.
  • Rabbits are fastidious animals and will frequently groom themselves.
British Dictionary definitions for fastidious


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
Cite This Source
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
Cite This Source
fastidious 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.
Cite This Source

Word of the Day

Difficulty index for fastidious

Few English speakers likely know this word

Word Value for fastidious

Scrabble Words With Friends

Quotes with fastidious

Nearby words for fastidious