[fa-stid-ee-uh s, fuh-] /fæˈstɪd i əs, fə-/ Show IPA
excessively particular, critical, or demanding; hard to please:
a fastidious eater.
requiring or characterized by excessive care or delicacy; painstaking.
Origin 1375–1425;late Middle English < Latinfastīdiōsus 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 taediumtedium) + -ōsus-ous