"downhill" in the noun sense

1. downhill

the downward slope of a hill

2. downhill

a ski race down a trail

"downhill" in the adjective sense

1. declivitous, downhill, downward-sloping

sloping down rather steeply

"downhill" in the adverb sense

1. downhill

toward a lower or inferior state

"your performance has been going downhill for a long time now"

2. downhill

toward the bottom of a hill

"running downhill, he gained a lot of speed"

Source: WordNet® (An amazing lexical database of English)

Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.

View WordNet® License