pro·pen·si·ty 
/prəˈpɛnsəti/ noun
plural pro·pen·si·ties /prəˈpɛnsəti/ noun [count] formal : a strong natural tendency to do something
▪ Why do some people have a propensity for/toward violence? [=why are some people violent?; why do some people have a tendency to be violent?] ▪ He had a propensity for crime. ▪ She has a propensity to assume the worst. [=she tends to assume the worst]
▪ Why do some people have a propensity for/toward violence? [=why are some people violent?; why do some people have a tendency to be violent?] ▪ He had a propensity for crime. ▪ She has a propensity to assume the worst. [=she tends to assume the worst]
