Synonyms of the word

declivitous

• adj. Descending gradually; moderately steep; sloping; downhill.

descending

• v. present participle of descend.
• n. A descent.

downhill

• adv. Down a slope.
• adj. located down a slope or hill.
• adj. going down a slope or a hill.
• adj. (by extension) easy.
• adj. (by extension) deteriorating, getting worse.
• n. (uncountable) The fastest of the disciplines of alpine skiing.
• n. (countable) A rapid descent of a hill in related sports, especially in alpine skiing.