1. most gruesome, horrifying, or causing revulsion (superlative form of grisly)

Examples

• The detective had seen many crime scenes, but this was the grisliest one yet.
• She couldn’t watch the grisliest parts of the horror movie.
• The war documentary showed some of the grisliest footage ever captured.
• Even experienced surgeons found it the grisliest operation they had performed.
• The grisliest details of the accident were kept from the public.
• That was the grisliest ghost story I’ve ever heard.