Feeble, insipid (5-5)
I believe the answer is:
wishy-washy
I believe this clue is a double definition.
'feeble' is the first definition.
(I've seen this before)
'insipid' is the second definition.
(thesaurus)
(Other definitions for wishy-washy that I've seen before include "Bland -- pale" , "Ineffectual" , "Feeble, insipid" , "Watered-down" , "Diluted" .)