portentous
"Art," she declares portentously, "is whatever you choose to frame."
He announced portentously that "a panel of judges will be roving the racecourse" deciding who wins the "Best Hat" award.
"Whether you like it or not," she announced portentously, "your father and I have become good friends."

SMART Vocabulary: related words and phrases

Showing arrogance and conceit
(as) proud as Luciferidiom
airs and gracesidiom
arrogant
arrogantly
as if you owned the placeidiom
egoistic
egoistically
egomaniacal
egomaniacally
egotistic
patronizing
patronizingly
pomposity
pompous
pompously
swollen head
swollen-headed
talk down to someone
think the (whole) world revolves around youidiom
throw your weight aroundidiom

Examples of portentously

portentously
The clouds which had long been hovering portentously in our skies now began to spread and to blacken all around the heavens.
From Project Gutenberg
He paused portentously, finding in each face before him an anxious excitement which was exactly what he wanted.
From Project Gutenberg
Then they made a trip which came near being a solemn occasion, it was so portentously important.
From Project Gutenberg
The old man winked one faded eye portentously.
From Project Gutenberg
The lad seems to wish to make up for the natural insignificance of his face by frowning on all occasions most portentously.
From Project Gutenberg
The president frowned again; more portentously, this time.
From Project Gutenberg
This section is silent, ominously silent, portentously and potentially silent.
From Project Gutenberg
But the nation meantime was portentously preparing material for a literature which many wondering centuries to follow would occupy themselves with writing.
From Project Gutenberg
Still, is there any need of pulling quite such a portentously long face?
From Project Gutenberg
He shook his head portentously when the captain inquired after his health and spirits.
From Project Gutenberg
It represented a gaunt, ascetic-looking monk, in a tattered gown and cowl, kneeling with clasped hands and pulling a portentously long face.
From Project Gutenberg
She said it portentously, as bidding him remember he might be sorry when she was no more.
From Project Gutenberg
He winked portentously, and strangely enough his eyelid failed to resume its normal position.
From Project Gutenberg
It was, that the crowds everywhere had become portentously silent.
From Project Gutenberg
He looked so portentously solemn, that when you learnt that he was perfectly well in mind, body and estate, the inclination to laugh was irresistible.
From Project Gutenberg
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.