The phrase "all that dreadful" is correct and usable in written English.
It can be used to express a strong negative opinion or feeling about something, often emphasizing the extent of the dreadfulness.
Example: "The movie was all that dreadful; I couldn't sit through the entire thing."
Alternatives: "so terrible" or "quite awful".
We wonder if maybe we're not still prime minister and all that dreadful business over Europe and the community charge might have been just a bad dream.
"It is not all that dreadful to die, because it was not all that bad before you were born".
Hope had seemed lost half a dozen times, only to find through Lee's resourcefulness something new on which to fix itself; hope had sustained the army on all that dreadful march; hope was now reduced to the possibility that only Union cavalry and none of the blue-coated infantry stood in the way.
And I'd be frustrated that no matter how hard I tried to follow all that dreadful advice, my health and fitness would continue to worsen.
Irish Times journalist Brian Boyd wrote: "Bloated and over-heated (much like the band themselves at the time), the album has all that dreadful braggadocio that is so characteristic of a cocaine user".
Those people who we do not care to think of, yet it must be true that sometimes dreadful tyrannies were all that liberated the victims of other dreadful tyrannies.
I thought he was disgraceful a few 6 Nations ago when Wales played Scotland at the Millenium Stadium when he was actually condoning the Welsh cheating (my opinion), I'm sure all Scotland supporters remember that dreadful game... Godman e.t.c.
"This dreadful event reminds us all that policing is a mission that ultimately some die for.
"It was during that football match that, after all the dreadful things he had experienced, they were mown down by machine-gun fire [from German aircraft].
Thus, like Odysseus, Obama must steer the U.S. ship through the troubled waters of the Middle East while trying to avoid being dragged into a conflict that pits our enemies in a bloody civil war that, for all the dreadful toll it takes on Syrian civilians, suits us just fine if neither side emerges victorious.
"When you are reading all this dreadful news in the paper, a lovely 500-page novel by Marian Keyes or a classic by Charles Dickens takes you right away from all that".
