Reluctance (noun)

1. Hesitation or unwillingness to do something.
2. Unwillingness to accept or comply with something.

Origin:

Late 16th century (in the sense "hesitation"): from french réluctance or latin reluctantia, from reluctari "struggle against" (see reluctant).

Examples:

1. He had a reluctance to commit to the plan.
2. There was a reluctance on the part of the government to take action.
3. She was overcome by a reluctance to leave.
4. He felt a reluctance to interfere in the situation.
5. The reluctance of the employees to accept the new conditions.