adjective
unwilling
un-WIL-ing/ʌnˈwɪlɪŋ/
Not wanting or agreeing to do something.
The man is unwilling to clean the spill and refuses the offered mop.

Etymology
With will expressing desire, willing came to mean eager or ready to act; its negation marks reluctance. Unwilling may continue an older formation or have been formed anew from un- and willing.
In context
I was very unwilling to go into general practice for my tastes were all in the direction of Science and especially of zoology
More examples
- He is unwilling to lend anyone his car.
- I became an unwilling participant in their argument.
- The company seems unwilling to negotiate a lower price.
Forms
unwilling
unwillingly adverb — Without wanting or agreeing to act.
unwillingness noun — A lack of desire or consent.