This is the 15114th most frequent German word.
steil
Steep.
Here, 'steil' describes the steep incline of the mountain, referring to the physical geography.
Der Berg ist sehr steil.
The mountain is very steep.
Here, 'steil' metaphorically describes the rapid ascent or progress in his career, indicating notable achievement.
Das ist eine steile Karriere, die er hingelegt hat.
That's a rapid career path he has accomplished.
In this context, 'steil' is used informally to describe a bold or daring statement, extending beyond literal or metaphorical inclines into personal expression.