Improve your vocabulary with our brief audio lessons. This one is about the expression, or saying faintest idea. The meaning of this expression is: To not know anything at all about something. You have no idea what someone is talking about. Examples: 'Do you know where John buys his clothes?' 'I haven't got the faintest idea.' I haven't got the faintest … [Read more...] about English expression: Faintest idea