Unappealing (4)
I believe the answer is:
ugly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unappealing</span>' is the definition.<br/ ><span class="explanation-format__explanation">(unattractive)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ugly that I've seen before include "Hideous" , "Unpleasing to the eye" , "Unlovely" , "Displeasing to the senses" , "Monstrous" .)