Abrupt, terse (4)
I believe the answer is:
curt
This clue is a double definition.
'abrupt' is the first definition.
(I've seen this before)
'terse' is the second definition.
(synonyms)
(Other definitions for curt that I've seen before include "Brusque, short" , "Rude" , "Dismissively short" , "Brief, dismissive" , "Shrub with bright autumn colours" .)