reluctance
/rɪˈlʌktəns/noun
mass noun
1- unwillingness or disinclination to do something不情愿, 勉强：
she sensed his reluctance to continue.
她察觉到他不愿继续下去。
1.1
- Physics the property of a magnetic circuit of opposing the passage of magnetic flux lines, equal to the ratio of the magnetomotive force to the magnetic flux【物理】磁阻。