If you're looking for synonyms for the word "ghastly," there are plenty of options to choose from. Some other words that could be considered synonymous with "ghastly" include things like "horrific," "gruesome," "terrifying," "frightening," "spine-chilling," "hair-raising," "blood-curdling," "macabre," "terrifying," and "harrowing." All of these words are often used to describe something that is truly disturbing or unsettling, and they can be used to convey a wide range of emotions and reactions depending on the context in which they are used. Whether you're trying to describe a nightmare, a horror movie, or a particularly gruesome scene from a book, there are many different words you can use to capture the feeling of "ghastly".