那家餐厅的服务糟透了。

The service at that restaurant was absolutely ___dreadful.

他意识到自己在计算中犯了一个可怕的错误。

He realized he had made a ___dreadful error in his calculations.

她从一场可怕的噩梦中醒来，感到非常不安。

She woke up from a ___dreadful nightmare, feeling very unsettled.