noun Etymology: Will (nickname for William) + of + the + wisp Date: circa 1661 ignis fatuus 1, a delusive or elusive goal, ~ adjective
WILL-O'-THE-WISP
Meaning of WILL-O'-THE-WISP in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012