From facetious + -ness. facetiousness (usually uncountable, plural <span class="searchmatch">facetiousnesses</span>) (uncountable) The state of being facetious (countable) The product...
13,[1] The Duke […] willingly interposed the pleasures of wit and <span class="searchmatch">facetiousnesse</span> with the grave cares of his government, tempering wisely his troubles...