Propensity

1. noun

   a disposition to behave in a certain way

   “the aptness of iron to rust”

   Similar: aptness

2. noun

   an inclination to do something

   “he felt leanings toward frivolity”

   Similar: leaning, tendency

3. noun

   a natural inclination

   “he has a proclivity for exaggeration”

   Similar: proclivity, leaning