Stern and unsmiling (4)
I believe the answer is:
grim
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stern and unsmiling</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for grim that I've seen before include "Severe; horrible" , "Dour, forbidding" , "Stern, cruel" , "Dour and severe" , "Dark, depressing" .)