| perpendicular(adjective, sharp, course, straight, upright) |
| steep(adjective, sharp, course, extreme, straight) |
| vertical(adjective, sharp, straight, upright, erect) |
| erect(adjective, sharp, course, straight, upright) |
| plumb(adjective, straight, upright, steep, erect) |
| precipitous(adjective, sharp, course, sheer, vertical) |
| raised(adjective, sharp, course, straight, erect) |
| sheer(adjective, sharp, course, straight, upright) |
| stand up(expression, adjective, upright, vertical) |
| upright(adjective, straight, steep, erect, vertical) |
| upstanding(adjective, straight, erect) |
| cocked(adjective, straight, upright, erect, vertical) |
| on end(expression, adjective, straight, upright, steep) |
| orthogonal |
| plunging |
| stand-up(adjective, straight, upright, steep, erect) |
| standing(adjective, straight, upright, steep, erect) |
| up-and-down |
| abrupt(adjective, sharp, course, upright, sheer) |
| arduous(adjective, sharp, course, sheer, vertical) |