There are numerous synonyms for the word "Gastly" which includes horrifying, terrible, frightful, ghastly, grisly, macabre, sinister and many more. These words define something that is unpleasantly scary or ominous. Gastly can be used to describe a range of situations such as a haunted house, eerie mood, or a person's deathly appearance. These synonyms help to enhance the meaning of the word and add a layer of intensity to the description of any situation. It is important to carefully select the appropriate synonym to communicate the exact meaning and to ensure that the desired effect is conveyed to the reader or listener.