Gravitas
Etymology
Latin "gravitas" meant heaviness or weight, and Romans prized it as a cardinal virtue of sober, responsible conduct. It shares its root with "gravity," "grave," "aggravate," and "gravid," heavy with child.
noun · /GRAV-ih-tahss/
Dignified seriousness and weight of character that commands respect.
What it names
The earned heaviness of bearing that makes people take a person seriously without effort.
Example
The junior minister was quick and clever but lacked the gravitas to steady a room in a crisis.
Related idea
The same "gravis," heavy, that gives physical gravity; gravitas is moral weight rather than physical mass.