abysmal - terrible
Something ‘abysmal’ is worse than bad, it’s appalling and lacking in any positive or redeeming feature. The strength of the word means that it is used more sparingly than some of its milder synonyms, such as ‘terrible’, and can cause great offence when applied to a person’s performance, for example.
Something has to be done about the abysmal working conditions in that factory. It’s not just dangerous, it’s inhumane.
The students performed abysmally in their exams. As their teacher, I have to take my share of responsibility for that.
There’s no way I’d eat in that restaurant again. The food and service were utterly abysmal!