Ways to Say I DON'T KNOW

• I have no idea.
• I don't have a clue.
• I'm unsure.
• Search me.
• Hmm (interjection).
• I don't know anything about...
• I'm going to investigate that further.
• That requires a bit more research first.
• Beats me.
• I'II double check and let you know.
• I can't remember off the top of my head.
• It's beyond me.
• It's a mystery to me.
• That's a good question, but I don't know.
• I'm not the best person to answer that.
• I'm afraid. I've no idea.