Meaning of the word "I have no idea" in English

What does "I have no idea" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

I have no idea

US /aɪ hæv noʊ aɪˈdiə/
UK /aɪ hæv nəʊ aɪˈdɪə/
"I have no idea" picture

Phrase

used to emphasize that one does not know something

Example:
I have no idea where I left my keys.
A: 'How much does it cost?' B: 'I have no idea.'