Proclivity is defined as a tendency to do something, especially something you shouldn’t.noun
An example of a proclivity is what causes a person to go to a casino even though they shouldn’t spend money.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
noun pl. proclivities
Origin: L proclivitas < proclivus, downward < pro-, before (see pro-) + clivus, a slope (see declivity)
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noun pl. pro·cliv·i·ties
Origin: Latin prōclīvitās, from prōclīvis, inclined : prō-, forward; see pro-1 + clīvus, slope; see klei- in Indo-European roots.