Appals is a word that is often used to describe a strong feeling of shock or horror. However, there are many other words that can be used to convey a similar sentiment. Synonyms for appals include horrify, shock, revolt, disgust, dismay, repel, scandalize, outrage, offend, and sicken. These words can be used in different circumstances to describe the same emotion of being dismayed or utterly disgusted. So, if you want to express your deep shock or horror, you can pick any of these synonyms as per your preference and use them in an apt context to convey your message effectively.