hesitancy

n.

迟疑，踌躇；

复数：hesitancies

1. I noticed a certain hesitancy in his voice.
   我注意到他的声音有点犹豫。
2. Sickness and hesitancy go hand in hand.
   病痛与犹豫总是结伴同行的。
3. He spoke out his mind without the slightest hesitancy.
   他毫无顾虑地谈出了自己的想法。

Vaccine hesitancy: an overview.
Vaccine hesitancy: Definition, scope and determinants
Vaccine hesitancy: Causes, consequences, and a call to action
Epidemiology of vaccine hesitancy in the United States.
HPV vaccine hesitancy: Findings from a statewide survey of healthcare providers
Mapping vaccine hesitancy-Country-specific characteristics of a global phenomenon.
Vaccine hesitancy, vaccine refusal and the anti-vaccine movement: influence, impact and implications.
Physician Communication Training and Parental Vaccine Hesitancy: A Randomized Trial.
Understanding vaccine hesitancy around vaccines and vaccination from a global perspective: a systematic review of published literatu...
A systematic review of interventions for reducing parental vaccine refusal and vaccine hesitancy