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Use "portentousness" in a sentence
"Over a long career, she has perhaps too easily found much to despair of both in her own country and abroad—and her portentousness can be tiresome."
"For the elements of Gauguin's mystique are apparent enough: a portentousness of pose or motif, a figure catching one's eye with a look of grave interrogation, a woman foursquare and impassive as an oceanic statue."
"I was walking around the kitchen all last night going "Hypsizygus tessellatus!" with great portentousness and magnificent gesticulations."