Unfriendly, cold (6)
I believe the answer is:
frosty
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">unfriendly</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">cold</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for frosty that I've seen before include "Lacking in warmth" , "Cold and unfriendly (glance or reception?)" , "showing little enthusiasm" , "Chilly in attitude, like musical snowman" , "Icy cold" .)