different between proclivity vs acclivity

English

From Latin pr?cl?vit?s, from pro (“toward”) + cl?vus (“a slope, hill”).

proclivity (plural proclivities)

A predisposition or natural inclination, propensity, or a predilection; especially, a strong disposition or bent.
- , Episode 16
  This therefore was the reason why the still comparatively young though dissolute man who now addressed Stephen was spoken of by some with facetious proclivities as Lord John Corley.

First attested in 1614. From Latin accl?vit?s, from accl?vis (“ascending”), from ad + cl?vus (“slope”).

acclivity (plural acclivities)

(geomorphology) A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent.
- Just below it leaned a tottering crag that would have toppled, starting an avalanche on an acclivity where no sliding mass could stop.

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