adverb Chiefly British.
Examples from the Web for deucedly
Deucedly tired she must have been—and all that kind of thing.Lord Jim|Joseph Conrad
People of one idea get so deucedly narrow and tame, I've no patience with them.Rose in Bloom|Louisa May Alcott
"Deucedly draughty and uncomfortable they must have been," said Carstairs.The Guns of Europe|Joseph A. Altsheler
"He's deucedly intelligent," his lordship explained, with quiet enthusiasm.The Purple Heights|Marie Conway Oemler
You're deucedly suspicious and sensitive—far more so than I was with you.A Pessimist|Robert Timsol