Synonyms for Sloping (same or very similar meaning)
WordNet sense 1 (having an oblique or slanted direction):
aslant, diagonal, aslope, slanted, slanting, slopedWordNet sense 2 (at an angle to the horizontal or vertical position):
inclinedWordNet sense 3 ((of a topographical gradient) not steep or abrupt):
gradualFrom the ODE community, based on WordNetadd/edit