• Webster's Revised Unabridged Dictionary
    • a Declivous Descending gradually; moderately steep; sloping; downhill.
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Century Dictionary and Cyclopedia
    • declivous Sloping downward; having the character of a declivity; declivate: specifically, in zoology, said of parts which slope gently downward: as, a declivous mesosternum. Also, rarely, declivitous.
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In literature:

Upon the declivities of this hill the enemy had planted batteries so as to command our approach from any direction.
"Three Years in the Sixth Corps" by George T. Stevens
To climb a declivity, he seems to move forward and upward.
"How to Add Ten Years to your Life and to Double Its Satisfactions" by S. S. Curry
We then hurried down the steep declivity on the Tibetan side, to get away quickly from the bitterly cold, windy pass.
"In the Forbidden Land" by Arnold Henry Savage Landor
The declivities were gradual, and there was little fear of even a violent convulsion throwing the ice upon us.
"The Frozen Pirate" by W. Clark Russell
Kept on towards Powerscourt, which presently came in view from the edge of a declivity.
"A Tour in Ireland 1776-1779" by Arthur Young
A sunken road, sheltered by a stone wall, ran along the base of the declivity.
"History of the United States, Volume 4" by E. Benjamin Andrews
We will go over mountain tops and descend their steep declivities.
"The Land of the Long Night" by Paul du Chaillu
Metopidium: the anterior declivous surface of prothorax in Membracidae.
"Explanation of Terms Used in Entomology" by John. B. Smith
In Albay Province it grows on the declivities of the Mayon Volcano.
"The Philippine Islands" by John Foreman
Shortly, however, after descending a declivity, we turned into a lane, at the entrance of which was a gate.
"Lavengro The Scholar - The Gypsy - The Priest, Vol. 2 (of 2)" by George Borrow

In poetry:

The mountain, with the snow bank crowned;
The gorge, abysmal and profound;
Impress with aspect grand:
With unfeigned reverence I see
In canon and declivity
The All-Wise Hand.
"There Is An Air Of Majesty." by Alfred Castner King
A wilderness of weird, fantastic shapes,
Of precipice and stern declivity;
Of dizzy heights, and towering minarets;
Colossal columns and basaltic spires
Which pointing heavenward, appeared to wave
In benediction o'er the depths beneath.
"Grandeur." by Alfred Castner King