Insensitivity (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">insensitivity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that thoughtlessness is a type of unkindness)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for thoughtlessness that I've seen before include "The sort of insensitivity" , "Inconsiderate behaviour" , "that Chairman Mao was not noted for?" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">insensitivity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for numbness that I've seen is " Lack of feeling".)