Suddenly; brusquely (8)
I believe the answer is:
abruptly
I believe this clue is a double definition.
'suddenly' is the first definition.
(synonyms)
'brusquely' is the second definition.
(thesaurus)
(Other definitions for abruptly that I've seen before include "In a sudden way" , "In curt or disconnected manner" , "In a rude or curt manner" , "Suddenly and without warning" , "Quickly and without warning" .)