Origin of Fastidious
From Latin fastidiosus (“passive: that feels disgust, disdainful, scornful, fastidious; active: that causes disgust, disgusting, loathsome”), from fastidium (“a loathing, aversion, disgust, niceness of taste, daintiness, etc.”), perhaps for *fastutidium, from fastus (“disdain, haughtiness, arrogance, disgust”) + taedium (“disgust”). Confer French fastidieux.
Middle English squeamish, particular, haughty from Old French fastidieux from Latin fastīdiōsus from fastīdium squeamishness, haughtiness probably from fastus disdain
From American Heritage Dictionary of the English Language, 5th Edition
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