“积极性”的反义词：消极性。...

教练试图激发队员的积极性。The coach tried to get his charges motivated.和我共事的人大多积极性极高。I am working with mostly highly motivated people.失败会挫伤学生的积极性。Failure can demotivate students....

“积极性”的英语可以翻译为：enthusiasm，initiative，[法] activity，positivity，go-aheadism ...