Definition (知识)
Used to emphasize a complete lack of knowledge or understanding about something.
一无所知；一无所悙
"Have they decided what to do?" "I don't have the faintest idea."
「他们决定要做什么了吗？」「我完全不知道。」
When he asked me that question, I didn't have the faintest idea of the answer.
当他问我那个问题时，我完全不知道答案。
"What time will she arrive?" "I haven't the faintest idea."
「她什么时候会到？」「我完全不知道。」