The Collaborative International Dictionary of English v.0.48:

Fussiness \Fuss"i*ness\, n.
   The quality of being fussy.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fussiness
    n 1: an irritable petulant feeling [syn: irritability,
         crossness, fretfulness, fussiness, peevishness,
         petulance, choler]
    2: unnecessary elaborateness in details