Synonyms for Downhill:

n.

cross-country skiing, aspen, mogul, luge, binding, inner-tubing, chairlift, heliskiing. downward, ascending, under, skyward, bouncy, upward, down, up. downhill (noun)
descending, declivitous, downward-sloping.

Other synonyms:

cross-country skiing, mogul, luge, aspen, heliskiing, chairlift, inner-tubing. binding. Other relevant words:
down, ascending, inner-tubing, downward, heliskiing, under, luge, up, binding, mogul, upward, bouncy, skyward, aspen, chairlift.

Usage examples for downhill

  1. " But although I cannot be sure that a locomotive will never again fall downhill said Tom patiently, " I'm going to fix it so that warning need not be given by some operator along the line. – Tom Swift and his Electric Locomotive or, Two Miles a Minute on the Rails by Victor Appleton
  2. He called to the horses, and they came downhill the white stars on the two brown noses nodding up and down, George striding firm and heavy behind. – The White Peacock by D. H. (David Herbert) Lawrence
  3. Then they came to a part that was downhill – Bunny Brown and His Sister Sue in the Big Woods by Laura Lee Hope