Debased (8)
(Other definitions for demeaned that I've seen before include "Degraded, put down" , "Lowered in dignity or reputation" , "Given lower status" , "Lowered in status or reputation" , "Humiliated" .)
'debased' is the definition.
(I know that debased can be written as devalued)
This is the entire clue.
(Other definitions for devalued that I've seen before include "Leave dud to be reduced in price or estimation" , "Reduced the worth of" .)
'debased' is the definition.
(synonyms)
This is all the clue.
(Another definition for adulterated that I've seen is " Polluted".)