Pedestrian operating drill (6)
I believe the answer is:
boring
I believe this is a double definition.
'pedestrian' is the first definition.
(thesaurus)
'operating drill' is the second definition.
(to bore is to drill)
(Other definitions for boring that I've seen before include "Tedious and tiring" , "like watching paint dry?" , "Tedious, tiresome" , "flat" , "Dull and repetitive, a turn-off" .)