i Register
In some senses, dreadfully is marked as dated. Watch for register when choosing this word.
adv
In a dreadful manner; terribly.
You behaved dreadfully yesterday night
The smellful old heathen was snoring dreadfully.
Exceptionally, eminently, very much.
That restaurant seems dreadfully expensive.
At that moment a curious crack sounded inside the statue, as if something had broken. The fact is that the leaden heart had snapped right in two. It certainly was a dreadfully hard frost.