1) Acclivitous 2) Against difficulties 3) Arduous 4) Ascending 5) Difficult 6) Direction for sisyphus 7) Grueling as a battle 8) Kind of ascent 9) Laborious 10) Like a difficult battle 11) Like a tough battle 12) Like an arduous battle 13) Like difficult struggles 14) Rising 15) Toward the summit 16) Toward the top 1) Acclivitous 2) Ascending 3) Climbing 4) Hard 5) Up 
when skiing,refers to the side of the body which is facing the uphill side of the slope.
• (a.) Ascending; going up; as, an uphill road. • (a.) Attended with labor; difficult; as, uphill work. • (adv.) Upwards on, or as on, a hillside; as, to walk uphill.
[adv] - against difficulties 2. [adv] - upward on a hill or incline 3. [n] - the upward slope of a hill
adverb upward on a hill or incline; `this street lay uphill`
up or as if up the slope of a hill or other incline; upward: The soldiers marched uphill. Water does not run uphill without assistance.
Uphill, up the mountain.