Steepest

adjective

1. Of a near-vertical gradient; of a slope, surface, curve, etc. that proceeds upward at an angle near vertical.

   "a steep hill or mountain; a steep roof; a steep ascent; a steep barometric gradient"

2. Expensive

   "Twenty quid for a shave? That's a bit steep."

3. Difficult to access; not easy reached; lofty; elevated; high.
4. (of the rake of a ship's mast, or a car's windshield) resulting in a mast or windshield angle that strongly diverges from the perpendicular

   "The steep rake of the windshield enhances the fast lines of the exterior. http//legacy.sandiegouniontribune.com/uniontrib/20070303/news_lz1dd3maynard.html"