Somebody has a sweetheart they wish to marry. / (by extension) Someone is amenable to a suggestion.

Ready to do something that is not (can't be expected as) a matter of course.

(rare or obsolete) The execution of a will.

present participle of will

The state of being willing

Of one’s own free will; freely and spontaneously.

(idiomatic, US, informal) Barring unforeseen circumstances.

(politics) A group of countries whose leaders have been persuaded by another to take up a specific task, usually in the context of an invasion or war.

plural of willing

As much as one wishes to achieve something, the frailties of the human body often make it impossible.