Source : Webster's Revised Unabridged Dictionary (1913)

Gumminess \Gum"mi*ness\, n.
   The state or quality of being gummy; viscousness.

Source : WordNet®

gumminess
     n : the property of being cohesive and sticky [syn: {cohesiveness},
          {glueyness}, {gluiness}, {ropiness}, {viscidity}, {viscidness}]