dreadfully
adverb
UK/ˈdred.fᵊl.i/
US/ˈdred.fᵊl.i/
Definitions of dreadfully adverb
quality
In an extremely poor or bad manner.
Her conduct was dreadfully inappropriate.
They played dreadfully in the match.
The service at this restaurant was dreadfully poor.
degree
To a very great degree; extremely.
That movie was dreadfully scary.
He was dreadfully shocked by her rudeness.
I miss my family dreadfully.