There was a touch of morosity about the late Rector of Lincoln which led him to take gloomy views of men, particularly Oxford men.
Algy's morosity has returned tenfold, and he is performing the evolution familiarly known as "pulling your nose to vex your face."
Let no one be affrighted or turned away from the life of virtue and religion by your gloom and morosity.
It is his turn now, and his morosity is exchanged for an equally uncomfortable hilarity.
1530s "gloomy," from Latin morosus "morose, peevish, hypercritical, fastidious," from mos (genitive moris) "habit, custom" (see moral (adj.)). In English, manners by itself means "(good) manners," but here the implication in Latin is "(bad) manners." Related: Morosity.