Unceremonious — dull (5)
I believe the answer is:
blunt
I believe this is a double definition.
'unceremonious' is the first definition.
(thesaurus)
'dull' is the second definition.
(I know that dull can be written as blunt)
(Other definitions for blunt that I've seen before include "Obtuse; forthright" , "Forthright -- pointless" , "Frank and forthright" , "6 [JOHNSON]" , "Lacking edge; forthright" .)