It is notoriously true that the public mind is seriously agitated with apprehensions of negroes insurrections and that it is becoming more and more so.
— Thomas L. Smith

Heads of state are notoriously ill prepared for their mature careers; think of Adolf Hitler (landscape painter), Ho Chi Minh (seaman), and our own Ronald Reagan.
Barbara Ehrenreich notoriously quote

Publishers are notoriously slothful about numbers, unless they're attached to dollar signs -- unlike journalists, quarterbacks, and felony criminal defendants who tend to be keenly aware of numbers at all times.
— Hunter S. Thompson

The shortest way out of Manchester is notoriously a bottle of Gordon's gin; out of any businessman's life there is the mirage of Paris; out of Paris, or mediocrity of talent and imagination, there are all the drugs, from subtle, all-conquering opium to cheating, cozening cocaine.
— William Bolitho

Our feelings about how we're feeling are notoriously unreliable.
— Ariel Garten