not have the faintest(not) have the faintest (idea)
to have no knowledge of or no information about something.
'Do you know where Anna is? ' 'I haven't the faintest.'I haven't the faintest idea what you're talking about.
(often + question word)
not have the faintest (notion)
To have no knowledge or understanding about something. He doesn't have the faintest notion how hard it is to run a business.A: "Do you know where the car keys are?" B: "I don't have the faintest, sorry."
not have the faintest (idea)
have no idea. informal
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.’