not have the foggiest

not have the foggiest ( idea/notion )
idiom, spoken, informal
اصلا ندانستن، کاملا بی اطلاع بودن
to not know at all
هم معنی:
not have the faintest idea
to not have a clue

منابع

• https://www.ldoceonline.com/dictionary/not-have-the-foggiest-idea• https://www.powerthesaurus.org/foggiest_idea/synonyms

to not know or understand something at all
هیچ ایده و نظری نداشتن
I didn't have the foggiest idea what he was talking about