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

(rare or obsolete) The execution of a will.

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

present participle of will

The state of being willing

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

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.

(idiomatic, US, informal) Barring unforeseen circumstances.