Blunt — rude (6)
I believe the answer is:
abrupt
I believe this clue is a double definition.
'blunt' is the first definition.
(thesaurus)
'rude' is the second definition.
(thesaurus)
(Other definitions for abrupt that I've seen before include "Sudden, maybe rude" , "brisk" , "Short and rude" , "Short, sharp or sudden" , "Hurried or curt" .)