not have the faintest/foggiest

not have the foggiest (notion)

To have no knowledge or understanding about something. He doesn't have the foggiest notion how hard it is to run a business. A: "Do you know where the car keys are?" B: "I haven't the foggiest. Sorry."
See also: foggy, have, not

not have the faintest (idea)

have no idea. informal
See also: faint, have, not

not have the foggiest (idea or notion)

have no idea at all. informal, chiefly British
See also: foggy, have, not

not have the ˈfaintest/ˈfoggiest (idea)

(British English, informal) have no idea at all about something; not know anything at all: I haven’t got the faintest idea what to buy Roger for his birthday.‘Where are we?’ ‘I’m afraid I haven’t the foggiest.’
See also: faint, foggy, have, not
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