but terribly unintuitive

English as a Second Language English Vocabulary, Grammar and Idioms
1

[color=red]but terribly unintuitive — the same downward swipe that gets you into the camera from home acts as a back button everywhere else. Figuring these things out is a frustrating process of trial and error.

what does it mean “but terribly unintuitive”?

2

It is very unintuitive (it is not easy to understand and use straight away. It takes time to get used to it.)