Unceremonious
I believe the answer is:
abrupt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unceremonious</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for abrupt that I've seen before include "Sudden, brusque" , "Offhand" , "Impolite" , "Snap!" , "Curt and brief" .)