Unmannered (4)
I believe the answer is:
rude
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unmannered</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rude that I've seen before include "Unpleasant" , "likely to offend" , "Impolite, without consideration" , "Impolite; basic" , "Insolent" .)