Proclivity

/proʊˈklɪv.ɪ.ti/ noun medium

A proclivity is an ingrained preference or habitual leaning toward a particular kind of behavior.

Even as a child, she showed a proclivity for taking apart machines just to see how they worked.

Memory Trick

Proclivity contains 'cliv,' related to incline as in a cliff's slope - a proclivity is the direction you naturally lean or slide toward.