not have the faintest idea
Totally without knowledge
To not have the faintest idea is to be completely ignorant of something—not just uncertain but without any knowledge whatsoever.
The phrase emphasizes total cluelessness: I don't have the faintest idea where she went.
Sometimes shortened to not have the faintest: Who took my keys? I haven't the faintest.
- slightestLeast in degree
- blankWithout marks or content
- lostUnable to navigate
- have a clueGrasp the situation
- nescientHaving no knowledge
haven't got a clue · guesswork · draw a blank · flummoxed · mystified · empty · oblivious · unaware · incomprehension · clueless · no idea · beats me · stumped · uninformed · at a loss · baffled · bewildered · fog
not have the faintest ideaknow full well
Understand with complete certainty
be positive · know like the back of one's hand · know inside out · know inside and out
not have the faintest ideasee clearly
get it · have a handle on · make sense of · fathom · wrap one's head around