Have No Idea

To "have no idea" is a strong way of saying you "do not know" something. Example: "What time is it?" Answer: "I have no idea." To "have no idea" expresses that you don't have enough information to make a definite statement about something. It can also be used in a sentence to communicate that there is some piece of information which is missing: "I can't find my keys. I have no idea where I put them."