grauenhaft
awful
Informal for extremely bad, terrible, or of very low quality.
Das Essen in diesem Restaurant war einfach grauenhaft.
The food in this restaurant was simply awful.

awful
Loading your saved state.
awful
Informal for extremely bad, terrible, or of very low quality.
Das Essen in diesem Restaurant war einfach grauenhaft.
The food in this restaurant was simply awful.

The adjective 'grauenhaft' (awful/horrifying) is derived from the noun 'das Grauen' (horror, dread). So it literally describes something so bad that it causes horror.
Beim Anblick der Zerstörung erfasste ihn das Grauen.
At the sight of the destruction, he was seized by horror.
In colloquial speech, 'grauenhaft' (awful) is often used as a strong exaggeration for 'very bad.' It then does not describe real danger, but only very poor quality, for example with food, weather, or music.
Ich fand den Film grauenhaft langweilig.
I found the film awfully boring.
You can tell from the context whether the exaggerated meaning (bad food) or the literal meaning (accident) is meant. Is it an everyday, subjective judgment or an objectively terrible event?
Seine neue Frisur ist einfach grauenhaft.
His new haircut is simply awful.
terrible
'schrecklich' and 'grauenhaft' both describe something very negative. 'schrecklich' is a general word for something very unpleasant, awful, or very bad. 'grauenhaft' often feels stronger and more emotional. It is especially suitable when something causes horror or disgust, but in informal speech it can also simply mean 'extremely bad'. In many everyday situations, you can use both words. However, 'grauenhaft' often sounds more dramatic than 'schrecklich'.

Am Wochenende war der neue Horrorfilm so grauenhaft, dass sie kaum schlafen konnte.
At the weekend, the new horror film was so horrifying that she could hardly sleep.
Wegen des schrecklichen Wetters bleiben wir heute mit den Kindern zu Hause.
Because of the terrible weather, we are staying home with the children today.