From WordNet (r) 2.0 (August 2003) [wn]:
uphill
adj 1: sloping upward [syn: acclivitous, rising]
2: hard to overcome or surmount; "a stiff hike"; "a stiff
exam"; "an uphill battle against a popular incumbant"
[syn: stiff]
n : the upward slope of a hill
adv 1: against difficulties; "she was talking uphill"
2: upward on a hill or incline; "this street lay uphill"
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Uphill \Up*hill"\, adv.
Upwards on, or as on, a hillside; as, to walk uphill.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Uphill \Up"hill`\, a.
1. Ascending; going up; as, an uphill road.
[1913 Webster]
2. Attended with labor; difficult; as, uphill work.
[1913 Webster]