...The Hungarian traveller naturally identified it with the mythical Lake Nyassa which has done such portentous mischief in a day now gone by... 
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...And even now, while questing noiselesslyand restlessly for food, he rarely failed to pay the tribute of aninstinctive, unconscious turn of head whenever that portentous voicecame up upon the wind...
Charles G. D. Roberts 「The Watchers of the Trails」
...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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