reluctance

Dictionary: re·luc·tance   (rĭ-lŭk'təns) also re·luc·tan·cy

1. The state of being reluctant; unwillingness.
2. Physics. A measure of the opposition to magnetic flux, analogous to electric resistance.

noun

The state of not being disposed or inclined: averseness, disinclination, indisposition, unwillingness. See willing/unwilling.

Definition: unwillingness
Antonyms: eagerness, willingness

Resistance to the flow of magnetic lines of force.

The noun has 2 meanings:

Meaning #1: (physics) opposition to magnetic flux (analogous to electric resistance)

Meaning #2: a certain degree of unwillingness
  Synonyms: hesitancy, hesitation, disinclination, indisposition