Still voice? (7)
I believe the answer is:
passive
I believe this is a double definition.
'still' is the first definition.
(thesaurus)
'voice?' is the second definition.
(I know that passive is a type of voice)
(Other definitions for passive that I've seen before include "Inactive or non-resistant" , "Not actively responsive" , "Unresisting" , "sort of voice" , "Inert, lethargic" .)