Overweeningness (6)
I believe the answer is:
hubris
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">overweeningness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hubris that I've seen before include "Overbearing pride or self-confidence" , "The pride that goes before a fall" , "feeling of superiority" , "Arrogant pride, from the Greek" , "Excessive pride" .)