IPA: /ˈɡrɪzlinəs/
KK: /ˈgrɪzlinəs/
The quality of being very unpleasant or shocking, often related to something gruesome or horrifying.
The grisliness of the horror movie made some viewers feel uneasy.
Grisliness is formed from "grisly" (from Old English "grislic", meaning horrible or fearful) and the suffix "-ness" (meaning the state or quality of). The word "grisliness" refers to the quality of being grisly or horrifying.
Think of something that is 'horrible' or 'fearful' ('grisly') and remember that 'grisliness' means the state of being horrifying.