1. Being both scenic and dangerous.
She told me the hike would be treacheresque. I nearly died on the way back.
2. Appropriate answer when replying to people you don’t like that much.
“How was the hike? We were thinking of doing it.”
“Oh, it’s absolutely treacheresque. You should totally do it.”
“Trea… you mean picturesque?”
“Yes, that. And so much more…”