Ungrateful (9)
I believe the answer is:
thankless
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ungrateful</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that ungrateful can be written as thankless)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for thankless that I've seen before include "Unappreciated" , "Showing no gratitude" , "Receiving no appreciation" .)