But so is turning up to a meeting and not having the foggiest what was decided last time out.

但在对上次会议作出的决定一无所知的情况下出席会议时也同样痛苦。

So instead of saying, I don't know, you could also say, I don't have the foggiest idea.

因此，你不必说“我不知道”，而可以说“我一点儿也不知道”。