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declivous

or de·cli·vent

[dih-klahy-vuh s]
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adjective
  1. sloping downward.
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Origin of declivous

1675–85; < Latin dēclīv(is) (see declivity) + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018