Willingness is being glad to do what is asked. Not just agreeing — agreeing without being pushed.
The word takes to and a verb: a willingness to help, a willingness to listen, a willingness to compromise. It is one of the qualities most often praised in references and negotiations, because it describes attitude rather than ability. The adjective willing works alone and in the phrase willing to, and the opposite is unwillingness. English has a nice old phrase for it in willing hands, meaning people glad to pitch in.
1nounwillingnessReadiness to do something without being forced.
“He showed a real willingness to learn.”
Old English
willende
English
willing
English, today
willingness
From willing + -ness. willing adjective Old English willende, present participle of willan*
Etymology from Wiktionary, CC BY-SA