Unfeeling; heartless
I believe the answer is:
stony
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">unfeeling</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">heartless</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for stony that I've seen before include "Rock-strewn" , "Rocky" , "made of marble?" , "Heartless" , "Cold, unfeeling" .)