uphill
Definitions
Moving or situated toward the top of a hill or slope.
Requiring strenuous effort; difficult or arduous.
Examples
The cyclists struggled as they pedaled up the steep uphill path.
It was an uphill battle to convince the board to approve the new project.
We had to carry our heavy backpacks on an uphill climb for three miles.
Synonyms
arduous strenuous taxing difficult challenging laborious steep