[ 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

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


synonym study for fastidious

1. See particular. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for fastidiously

British Dictionary definitions for fastidiously

/ (fæˈstɪdɪəs) /


very critical; hard to please
excessively particular about details
exceedingly delicate; easily disgusted

Derived forms of fastidious

fastidiously, 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

Medical definitions for fastidiously

[ 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.