Other forms: ghoulishly
Ghoulish things are scary or morbid. A ghoulish sense of humor favors jokes about death and gore.
An interest in other people's misfortune could be called ghoulish, and so could a fascination with deadly car accidents or plane crashes. The horrified feeling you might get when you think about death is the essence of something ghoulish. This adjective comes from ghoul, "an evil spirit," from the Arabic ġūl, a mythological corpse-eating demon.