Synonyms for Gummy (same or very similar meaning)
WordNet sense 1 (treated with an adhesive gum):
gummedWordNet sense 2 (having the sticky properties of an adhesive):
gluey, glutinous, mucilaginous, pasty, sticky, viscid, viscous, pastyWordNet sense 3 (tending to adhere):
adhesiveFrom the ODE community, based on WordNetadd/edit