dreadful at or scared at

[vkhu]

He was so dreadful at the voice that he couldn't even move
He was so scared at the voice that he couldn't even move

The bold one is the answer my teacher provided me with (this is a fill-in-the-blank question) but I think dreadful at can still be used. So is it alright to put dreadful before at?

[bhaisahab]

He was so dreadful at the voice that he couldn't even move
He was so scared at the voice that he couldn't even move

The bold one is the answer my teacher provided me with (this is a fill-in-the-blank question) but I think dreadful at can still be used. So is it alright to put dreadful before at?

No. If you are dreadful at something, it means that you are unable to do it correctly. I think "of" would be better than "at" in your sentence.

[Barb_D]

"Dread" is the emotion you feel when you are very unhappy about something that you know is coming.

You can be "full of dread" but that is not at all the same as being "dreadful."

Your original sentence could have been "He was so full of dread when he heard the voice that..."