The Collaborative International Dictionary of English v.0.48:

Juiciness \Jui"ci*ness\, n.
   The state or quality of being juicy; succulence plants.
   [1913 Webster]

WordNet (r) 3.0 (2006):

juiciness
    n 1: a juicy appetizingness [syn: succulence, succulency,
         juiciness]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "juiciness":
   callowness, chylifaction, chylification, delectability,
   delectableness, deliciousness, dewiness, flavorsomeness, flow,
   fluency, fluidity, fluidness, flux, fluxility, fluxion, freshness,
   greenness, immaturity, inexperience, infancy, juniority, lactation,
   lactescence, liquefaction, liquidness, lusciousness, milkiness,
   minority, moisture, nonage, rawness, rheuminess, sappiness,
   savoriness, serosity, succulence, suppuration, tastiness,
   undevelopment, unripeness, wateriness