It's more subtle than "gibberish and/or internally inconsistent" as opposed to "intentional misrepresentation". Frankfurt sets this important subtlety out qui

It's more subtle than "gibberish and/or internally inconsistent" as opposed to "intentional misrepresentation". Frankfurt sets this important subtlety out quite early IIRC, as being about the reflective capacity of the bullshitter. The liar has clear reflection and intent, and may be highly intelligent and able to construct clever arguments. A troll only wants to hurt and uses disingenuous talk instrumentally. The idiot may offer up enthusiastic but confused jibber-jabber whose truth content is patchy/questionable but lacks deceptive intent. We can all be liars, mean or idiots from time to time as we are sly, insecure or careless through language. Even when acting in good faith most of us are in the epistemological bind of spreading misinformation that seems true and justified, but we're unable to verify. The bullshitter; does . not . give . a . fuck . It's a sociopathic disregard for feelings, consequences, truth or falsehood. The bullshitter is immersed in their own fantasy of confidence and will do or say anything that keeps it's momentum going. When challenged with real contrary evidence the bullshitter doubles down. You can see it in trained bullshitters, politicians, company PR spokespeople, and drunks who are too far gone to keep themselves in check. Most of it is benign. You can still learn a lot from or about a bullshitter by filling in the gaps around what the fantasy means to them. Professional bullshit is a whole different problem and is deeply corrosive so society - and there's mountains of it because the system must, at all costs save face.