Definition of ultrafastidious
: extremely or extraordinarily fastidious (as in attention to neatness or detail)
an ultrafastidious worker/dresser/housekeeper … an ultrafastidious reconstruction of the 1969 show …— Holland Cotter
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Merriam-Webster unabridged
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Time Traveler for ultrafastidious
The first known use of ultrafastidious was in 1847
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