Improperly (6)
I believe the answer is:
unduly
'improperly' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for unduly that I've seen before include "Excessively or improperly" , "Unnecessarily" , "Excessively, unreasonably" , "Excessive, unjustified" , "Unjustifiably" .)