spontaneity

US /ˌspɑːn.tənˈeɪ.ə.t̬i/
UK /ˌspɑːn.tənˈeɪ.ə.t̬i/
1.

spontan

the quality of being natural rather than planned in advance:

:
•
You should not plan out the entire mock interview beforehand or you will lose the element of spontaneity.