N-COUNT [oft NOUN to-infinitive](性格上的)倾向;习性 A propensity to do something or a propensity for something is a natural tendency that you have to behave in a particular way. (性格上的)倾向;习性 [formal]
Mr Bint has a propensity to put off decisions to the last minute. [+ for]
宾特先生习惯拖到最后时刻才作决定。
She hasn't reckoned on his propensity for violence.