1) Closer to vertical 2) Comparatively costly 3) Harder to climb 4) Harder to traverse 5) Increasing in pitch 6) More costly 7) More excessive 8) More exorbitant 9) More precipitous 10) More sharply inclined 11) More sharply sloped 12) More vertical 13) Not as cheap 14) Not as inexpensive 15) Not so reasonable Found on https://www.crosswordclues.com/clue/steeper