Portentously

[pɔ:'tentəsli]

(adv.) in a portentous manner; 'portentously, the engines began to roll'.

Typed by Harley--From WordNet

As she entered and closed the door on herself, he sank down in a chair, and gazed and sighed and puffed portentously. William Makepeace Thackeray. Vanity Fair.
He received us to-day, portentously arrayed in his best black suit, and his stiffest white cravat. Wilkie Collins. The Moonstone.
The lamps across his streets had a portentously elastic swing with them. Charles Dickens. A Tale of Two Cities.
Her father gives her such a portentously hard-headed reputation, that I have a burning desire to know. Charles Dickens. Hard Times.
Pott nodded portentously. Charles Dickens. The Pickwick Papers.

Typed by Harley