1. The state of being calm, stable and composed, especially under stress. 2. Derived from “aequus,” a Latin adjective meaning “level” or “equal.” “Equanimity” comes from the combination of “aequus” and “animus” (“soul” or “mind”) in the Latin phrase aequo animo, which means “with even mind.” 3. To the degree that a person develops their Emotional Intelligence, they will also increase their equanimity. 4. Unresolved painful emotional experiences from a person’s past detract from their ability to maintain equanimity.