...Of the world of sound there remained only the crackling of our fires, the tiny singing of the blood in our ears, and that far-off portentous roar... 
Stewart Edward White 「African Camp Fires」
...A portentous current soon swept us past Père la Chaise, and shortly after noon we were comfortably at breakfast with Sr...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...Peering between the rails he saw a tall, dark shape,with gigantic head, vast antlers, and portentous bulk of shoulder,step noiselessly from the thicket and stand motionless...
Charles G. D. Roberts 「The Watchers of the Trails」
...Presently another door yielded to the inventor's deft touch and closedbehind them with a portentous chug...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...It is the strata at the bottom of thegeological scale that are of the most portentous thickness, and the onlyorganism suspected in them is the doubtful Eozoon Canadense...
Oliver Lodge 「Pioneers of Science」
...andthe sky looked more portentous of rainy weather than we had ever seen iton this journey...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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