Unwilling means not wanting to do what is asked. You may still do it, but not gladly.
It takes to and a verb: unwilling to answer, unwilling to move. The distinction from reluctant is fine, since reluctant suggests hesitation that might be overcome and unwilling suggests a settled no. It also works in front of a noun to mean forced, as in an unwilling participant. The noun is unwillingness, and the opposite pair, willing and willingness, behave in exactly the same way.
1adjectiveunwillingNot wanting to do something.
“He was unwilling to explain where he had been.”
Old English
willende
English
willing
English, today
unwilling
From un- + willing. willing adjective Old English willende, present participle of willan*
Etymology from Wiktionary, CC BY-SA