You know what it looks like… but what is it called?
TAKE THE QUIZ“willin”
The following 2 entries include the term willin.
will-in-the-wisp
obsolete variant of will-o'-the-wisp
with the best will in the world
idiom: with the most sincere desire and effort to do something good or worthwhile —used especially to say that it is not possible to do something even if one wants to do it very much
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Merriam-Webster unabridged