Had no idea - Idioms by The Free Dictionary
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have no idea
To be completely unaware of or know no information about something. A: "Is Sally off today?" B: "Oh, I have no idea. Ask Elaine, she'll know."
have no iˈdea,
not have the first, slightest, etc. iˈdea not know something at all; not know how to do something at all: I’ve no idea what time it is. ♢ Don’t ask him to mend it; he hasn’t got the first idea about cars.