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.

plural of willing

(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.

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