Like glue; humid (6)
I believe the answer is:
sticky
I believe this is a double definition.
'like glue' is the first definition.
(I've seen this in another clue)
'humid' is the second definition.
(synonyms)
(Other definitions for sticky that I've seen before include "Awkward; tacky" , "Twiggy" , "Awkward - viscous" , "Adhesive; awkward" , "sultry?" .)