What's the difference between fatuity and morosis?

Fatuity

Definition:

Example Sentences:

(1) How could they have resisted another of his jaunty, trademark yarns, combining plot twists and utter fatuity in a way that just keeps you ploughing on, despite your better nature and the certainty that virtually any other activity would be a better use of these precious hours of life?
(2) One of my favourite online cartoons satirises the fatuity of sports cliches ("We sportsed our best and scored points, but the other team was sportsing, too, and they scored even more points"), and it's only by attending that I appreciated how hard sports writers have to work to make sports press conferences ("Do you think you will win the next match, Neymar?"
(3) These fatuities had few long-term consequences for Johnson when he got back to America.
(4) The impulse towards mediation or continuity is not noticeably a brake on their desire to speak forthrightly and truthfully about the work of other writers; Eliot, for example, did not hesitate to identify "a composite order of feminine fatuity" in the "mind-and-millinery" novels that she described in her essay "Silly Novels by Lady Novelists", published the same year as Aurora Leigh .

Definition:

Example Sentences:

(1) After all, his short time as prime minister had been characterised not only by frenetic political activity and legislative change but scandal in the form of the Khemlani Affair and the more literal affair of Jim Cairns and Junie Morosi .
(2) October 26, 2013 Jon Morosi (@jonmorosi) No DH a setback for Sox, but at least they can replace Ortiz late with Napoli -- and help ensure Pedroia not pitched around in key spot.