Wiktionary
vb. (context idiomatic English) To not know; to have no ide
Usage examples of "not have the faintest".
He had given his word to Lelldorin to bring certain things to the king's attention, but he did not have the faintest idea how to begin.
He looked at her pale, uncomprehending face and realized that she did not have the faintest idea of what he was talking about.
The only problem was that he did not have the faintest interest in her, and that would make it hard on her, since her parents were clearly hoping that he would.
But he would tell Jimmy and Danny and Tomba that it was complicated, and they would not have the faintest understanding of what he meant.
The crew would not have the faintest idea of who they were or what they were doing there.
There were other Horcruxes out there somewhere, but he did not have the faintest idea where they could be.
It is not very reassuring to have to rely on you and not have the faintest idea what you’.
It is not very reassuring to have to rely on you and not have the faintest idea what you're about.
It then blinked rapidly a few times and adopted a sort of perky expression of which Dirk did not have the faintest idea what to make.
He had once been accosted in the street by a woman who obviously knew him but he did not have the faintest idea of who she was.
He did not have the faintest idea what he was supposed to do next.