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
3 archaic : scornful
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