A propensity is a natural tendency to behave in a certain way. We all have propensities — things we tend to do. Dogs have a propensity to bark, and many people have a propensity for getting annoyed by it.

If you have a propensity for something, then it's something that comes naturally to you or something you just do a lot. Some people have a propensity to laugh. Other people have a propensity for making others laugh, or for being generous, or for getting angry. It's hard to change your propensities. Sometimes a propensity is a bad thing, as in a criminal with a propensity for theft or murder.

Definitions of propensity
  1. noun
    a natural inclination
    synonyms: leaning, proclivity
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    type of:
    disposition, inclination, tendency
    an attitude of mind especially one that favors one alternative over others
  2. noun
    an inclination to do something
    synonyms: leaning, tendency
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    type of:
    that toward which you are inclined to feel a liking
  3. noun
    a disposition to behave in a certain way
    “the propensity of disease to spread”
    synonyms: aptness
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    type of:
    a natural or acquired habit or characteristic tendency in a person or thing
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