cliv- +

Steep.

1. Sloping upward.
2. Moving, going, or growing upward.

1. An upward slope or grade; such as, in a road.
2. An upward slope on a hill.

1. Sloping upward; an ascent.
2. Rising as a hillside.
3. An upward slope, as of ground.

1. Decline, a slope or a slanting surface.
2. Sloping downward.

1. Sloping down rather steeply.
2. Moderately steep.

1. A downward slope or bend.
2. A surface; especially, a piece of land, that slopes downward.
3. A downward inclination; especially, of a piece of land.

Steep; a steep incline; such as, of a hill or a road.

1. A natural tendency to behave in a particular way.
2. A natural inclination, or tendency, to behave in a certain way; often objectionable or immoral.
3. Etymology: from Latin proclivitatem, proclivitas, "a tendency, propensity" from proclivis, "prone to"; literally, "sloping", from pro-, "forward" + clivus, "a slope".

Other meanings include: inclination, predisposition, propensity, tendency, penchant, and affinity.

Proclivity means someone is prone to doing or behaving in a certain way, as if leaning toward it. It differs from the word propensity in that proclivity is more of a natural or innate tendency and propensity is a general tendency.

Proclivity can also be a more negative tendency and is similar to penchant, which is a synonym that denotes both positive and negative tendencies.

1. Having the incisor teeth directed forward.
2. Inclined; tending by nature.