Particular about small details and easily upset about minor things; hard to satisfy.
From "fuss" which emerged in the 17th century, possibly from Scandinavian sources. The suffix "-y" means having the quality of.
Parents often say babies are 'fussy' about food, but this pickiness is actually a safety mechanism—young children are extra cautious about new foods to avoid toxins, so fussiness is evolution protecting them!
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