gracious + -osity. <span class="searchmatch">graciosity</span> (uncountable) (archaic) graciousness, usually in a bad sense, as implying duplicity ^ “<span class="searchmatch">graciosity</span>, n.”, in OED Online ...
edentulosity egregiosity frivolosity fungosity generosity geniosity gorgeosity <span class="searchmatch">graciosity</span> humongosity inconspicuosity jejunosity leprosity luxuriosity miraculosity...