proclivity

noun

Etymology: From Latin prōclīvitās, from prōclīvis (“prone to”).

1. A predisposition or natural inclination, propensity, or a predilection; especially, a strong disposition or bent.

   “The child has a proclivity for exaggeration.”

   “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.”