This is the 8055th most frequent Russian word.
круто
"Круто" means "cool" or "awesome" in English.
Here, "круто" is used to describe something impressive or enjoyable, synonymous with "cool."
Это было очень круто!
That was very cool!
In this context, "круто" describes the steep incline of the road, related to its physical orientation or grade.
Дорога здесь идёт круто вверх.
The road here ascends steeply.
Here, "круто" describes the sharp or brisk nature of the person's movement.