Completely? Only somewhat (5)
I believe the answer is:
quite
I believe this is a double definition.
'completely?' is the first definition.
(synonyms in phrases like 'are you quite done?')
'only somewhat' is the second definition.
('quite' can mean 'somewhat' or 'rather')
(Other definitions for quite that I've seen before include "To a degree" , "Rather" , "Somewhat; fully" , "Somewhat; completely" , "Completely or entirely - be quiet" .)