If someone is willing to do something, they are fairly happy about doing it and will do it if they are asked or required to do it. The military now say they're willing to hold talks with the political parties There are, of course, questions which she will not be willing to answer. = prepared unwilling
Free to do or to grant; having the mind inclined; not opposed in mind; not choosing to refuse; disposed; not averse; desirous; consenting; complying; ready
disposed or willing to comply; "someone amenable to persuasion"; "the spirit indeed is willing but the flesh is weak"- Matthew 26: 41
Willing is used to describe someone who does something fairly enthusiastically and because they want to do it rather than because they are forced to do it. Have the party on a Saturday, when you can get your partner and other willing adults to help unwilling, reluctant