not have the foggiest (idea)spokenNOT KNOW to not know at all 完全不知道;全然不明白 None of us had the foggiest idea about how to put the tent up. 我们都对搭帐篷一窍不通。
not have the foggiest (idea)• I don't have the foggiest idea what his address is.• Before I go on, some of you may not have the foggiest what a fanzine is.
→ not have the foggiest (idea) at foggy(1)