Hardhearted (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hardhearted</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for obdurate that I've seen before include "Obstinate and unrepentant" , "hard to influence" , "Inflexible" , "A doubter being stubborn" , "Stiff-necked" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hard-hearted</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ruthless that I've seen before include "Unmerciful" , "Without mercy or pity" , "Unsparing" , "Without pity or compassion" , "Hard-hearted" .)