The Collaborative International Dictionary of English v.0.48:
Gumminess \Gum"mi*ness\, n. The state or quality of being gummy; viscousness. [1913 Webster]WordNet (r) 3.0 (2006):
gumminess n 1: the property of being cohesive and sticky [syn: cohesiveness, glueyness, gluiness, gumminess, tackiness, ropiness, viscidity, viscidness]