Adhesive; vulgar (5)
I believe the answer is:
tacky
I believe this clue is a double definition.
'adhesive' is the first definition.
(thesaurus)
'vulgar' is the second definition.
(synonyms)
(Other definitions for tacky that I've seen before include "Gaudy" , "Tastelessly showy" , "like gum" , "(Of glue) slightly sticky" , "Sticky; showing poor taste" .)