The philosopher Professor Harry Frankfurt of Princeton University discusses this issue at length in his classic 1986 essay ‘On Bullshit’. Under his model, ‘bullshit’ is a form of falsehood distinct from lying: the liar knows and cares about the truth, but deliberately sets out to mislead; the truth-speaker knows the truth and is trying to give it to us; the bullshitter, meanwhile, does not care about the truth, and is simply trying to impress us:
