- Proclivity is defined as a tendency to do something, especially something you shouldn’t.
An example of a proclivity is what causes a person to go to a casino even though they shouldn’t spend money.
proclivity definition by Webster's New World
Origin: Classical Latin proclivitas ; from proclivus, downward ; from pro-, before (see pro-) plush clivus, a slope (see declivity)
proclivity definition by American Heritage Dictionary
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.