Definition of fastidious
1a
: showing or demanding excessive delicacy or care
fastidious attention to detail— Robert Evett
b
: reflecting a meticulous, sensitive, or demanding attitude
fastidious workmanship
c
: having high and often capricious standards : difficult to please
critics … so fastidious that they can talk only to a small circle of initiates— Granville Hicks
2
: having complex nutritional requirements
fastidious microorganisms
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Merriam-Webster unabridged
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Time Traveler for fastidious
The first known use of fastidious was in the 15th century
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