1.
If you say that something is ~, you mean that it is very bad or unpleasant, or very poor in quality.
They told us the ~ news...
= awful, appalling
ADJ
~ly
You behaved ~ly...
ADV: ADV with v
2.
Dreadful is used to emphasize the degree or extent of something bad.
We’ve made a ~ mistake...
= terrible
ADJ: ADJ n emphasis
~ly
He looks ~ly ill...
ADV: ADV adj, ADV after v
3.
If someone looks or feels ~, they look or feel very ill, tired, or upset.
Are you all right? You look ~...
ADJ: feel/look ADJ