Unmerciful (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unmerciful</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ruthless that I've seen before include "Unsparing" , "Hard-hearted" , "Showing no compassion" , "devoid of compassion" , "Harsh" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unmerciful</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pitiless that I've seen before include "Harsh, cruel" , "Remorseless, ruthless" , "Callous" , "Cold-hearted" , "feeling nothing" .)