"Goshawful" is a slang term used to describe something that is extremely bad or unpleasant. While this term may be commonly used in some circles, it is not always appropriate in more formal settings. Thankfully, there are a number of synonyms that can be used in its place. Some options include terrible, dreadful, abysmal, appalling, horrendous, and horrid. Each of these terms can be used to convey a sense of strong disapproval or aversion towards something, without resorting to the use of slang. Whether you're writing a formal report, or simply looking for a more sophisticated way to express yourself, these synonyms are a useful tool to have in your arsenal.