gnarly
1. slang Awesome; fantastic; excellent; extreme. Primarily heard in US. Whoa, dude, that was a gnarly wave you caught on your surfboard out there! That was a gnarly read—really ahead of its time!
2. slang Gruesome; extremely unpleasant. Primarily heard in US. The accident left a pretty gnarly gash on his thigh. I know I've got a pretty gnarly face, but I think I would make a really good husband if someone could look past it.