Frequency: The word is one of the 1500 most common words in English.
1.
A ~ experience or situation is very serious or very unpleasant.
Tens of thousands more suffered ~ injuries in the world’s worst industrial disaster...
I often have the most ~ nightmares...
= dreadful
ADJ
terribly
My son has suffered terribly. He has lost his best friend.
ADV: ADV after v
2.
If something is ~, it is very bad or of very poor quality.
She admits her French is ~.
= dreadful
ADJ
3.
You use ~ to emphasize the great extent or degree of something.
I was a ~ fool, you know. I remember that now...
ADJ: ADJ n emphasis
terribly
I’m terribly sorry to bother you at this hour...
ADV: usu ADV adj