propensity

nouns

an inclination to do something
"he felt leanings toward frivolity"
leaning, propensity, tendency
a natural inclination
"he has a proclivity for exaggeration"
leaning, proclivity, propensity
a disposition to behave in a certain way
"the aptness of iron to rust"; "the propensity of disease to spread"
aptness, propensity