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No, the word 'fussy' is an adjective, a word used to describe a noun (a fussy baby, a fussy eater).
The abstract noun form of the adjective 'fussy' is fussiness,
The word 'fussy' is the adjective form of the abstract noun fuss.
The population of Fussy is 1,878.
Fussy is an adjective.
FUSSY is exactly correct.
Yes, fussy is an adjective.