Equanimity
Etymology
From Latin “aequanimitas,” from “aequus” (even, level) and “animus” (mind, spirit) — an evenness of mind. The image at the root is of a spirit held perfectly balanced, neither tipped up by fortune nor down by misfortune.
noun · /ee-kwuh-NIM-ih-tee/
Calmness and composure of mind, especially in difficult situations.
What it names
The steady inner level that lets you meet good news and bad with the same unhurried, unshaken poise.
Example
She received the diagnosis with an equanimity that steadied everyone else in the room.
Related idea
Deep serenity is a calm that comes from peaceful conditions; equanimity is the harder discipline of staying balanced even when conditions are anything but calm.