the quality of being natural rather than planned in advance

You should not work out the entire mock interview beforehand or you will lose the element of spontaneity. 你不应该事先准备一整套模拟面试，否则你会失去自发性的因素。

The script has a refreshing spontaneity and sparkle. 脚本具有令人耳目一新的自然率真，充满亮点。

a way of behaving in which you do what feels natural and good whenever you want to, rather than planning things first

I got fed up with his procrastinating and lack of spontaneity. 我厌倦了他的拖延和造作。

He is attempting to hold on to the humour and spontaneity of his youth. 他试图保持年轻时的幽默和率真。