The phrase "is gruesome" is grammatically correct and can be used in written English.
It is often used to describe something that is extremely unpleasant or horrifying. Example: The crime scene was so gruesome that even the experienced detectives were shaken by the sight.
Dictionary
Exact(48)
The backdrop is gruesome.
(Be warned … it is gruesome).
His reward is gruesome.
The determination of it is gruesome.
"It is gruesome and twisted".
As television it is gruesome.
Similar(10)
They were gruesome.
The footage was gruesome.
"It's gruesome.
The play was gruesome.
Often their deaths were gruesome.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com