Unwholesome (5)
'unwholesome' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for seamy that I've seen before include "Sordid, disreputable" , "Disreputable (side)" , "Marked with joins; disreputable" , "Squalid" , "Sleazy, sordid" .)
'unwholesome' is the definition.
(associated in meaning)
This is the entire clue.
(Other definitions for noxious that I've seen before include "bad for you" , "Unpleasant and harmful" , "Disgusting" , "Unwholesome" , "Harmful, poisonous" .)