'Fussiest' definitions:
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Fussy \Fuss"y\, a. [Compar. Fussier; superl. Fussiest.]
Making a fuss; disposed to make an unnecessary ado about
trifles; overnice; fidgety.
[1913 Webster]
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Not at all fussy about his personal appearance. --R. G.
White.
[1913 Webster]