He has a propensity for getting into debt.

tendency : an inclination towards a particular characteristic or type of behaviour.
aptitude : a natural ability to do something.
characteristic : typical of a particular person, place, or thing.
quality : the standard of something as measured against other things of a similar kind; the degree of excellence of something.
propensity : an inclination or natural tendency to behave in a particular way.


Synonym of propensity is tendency