morosity

The story

1. Latin · derived frommorositas“peevishness”
2. French · derived frommorosité
3. English todaymorosity

From French morosité, from Latin morositas (“peevishness”), from morosus (“particular, scrupulous, fastidious, self-willed, wayward, capricious, fretful, peevish”), from mos (“way, custom, habit, self-will”).