Feeble, decadent (6)
I believe the answer is:
effete
I believe this is a double definition.
'feeble' is the first definition.
(I've seen this before)
'decadent' is the second definition.
(synonyms)
(Other definitions for effete that I've seen before include "Feeble, lacking vitality" , "Spent; degenerate" , "Ineffective, decadent" , "Affected, over-refined" , "Weak, effeminate" .)