the fact that someone is likely to behave in a particular way, especially a bad way(尤指不良的)倾向,嗜好,癖好
[ + to infinitive ] She's inherited from her father a propensity to talk too much.她从她父亲那里继承了话多的毛病。 He's well-known for his natural propensity for indiscretion.他天生鲁莽的毛病是出了名的。