Still inter badly (5)
I believe the answer is:
inert
'still' is the definition.
(thesaurus)
'inter badly' is the wordplay.
'badly' indicates anagramming the letters.
'inter' is an anagram of 'INERT'.
(Other definitions for inert that I've seen before include "Lifeless or static" , "Inter, being unable to move" , "Dormant, lifeless" , "Unreactive; still" , "Like some gases" .)