Collocations for steep - adj.

be, look, seem
become, get, grow

extremely, fairly, very, etc.
impossibly, incredibly, terribly
an incredibly steep hill

increasingly
deceptively
The terrain is often deceptively steep (= steeper than you expect).

Steep is used with these nouns:
angle, approach, ascent, bank, cliff, climb, curve, decline, descent, discount, dive, driveway, drop, face, fall, flight, gradient, hill, hillside, increase, mountain, path, price, recession, reduction, rise, road, rock, roof, slide, slope, stair, staircase, street, terrain, track, trail, valley