Tarnished (6)
(Other definitions for impure that I've seen before include "Contaminated or licentious" , "Sullied or adulterated" , "Assign a value to" , "Unclean" , "Dirty or immoral" .)
(Another definition for dulled that I've seen is " Dimmed".)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tarnished</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tainted that I've seen before include "Corrupted, sullied" , "Flawed, contaminated" , "corrupt" , "I attend to spoiled condition" , "Contaminated, polluted" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tarnished</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>