hesitancy
noun /ˈhezɪtənsi/
  /ˈhezɪtənsi/
[uncountable, singular]- the state or quality of being slow or uncertain in doing or saying something犹豫;踌躇;迟疑不决 - I noticed a certain hesitancy in his voice.我注意到他的声音有点犹豫。 
 
- I noticed a certain hesitancy in his voice.