
Ghastly
Shock Value
Use 'ghastly' to express shock or strong disapproval of something visually or morally disturbing. 
Intensity
Use 'ghastly' to intensify the description of a horrifying scene or event, beyond 'bad' or 'unpleasant'. 
Not Literal
Sometimes 'ghastly' is used metaphorically to express a severe level of disapproval unrelated to physical sights. 