Evenness of mind; that calm temper or firmness of mind which is not easily elated or depressed; patience; calmness; composure; as, to bear misfortunes with equanimity
Equanimity is a calm state of mind and attitude to life, so that you never lose your temper or become upset. His sense of humour allowed him to face adversaries with equanimity. calmness in the way that you react to things, which means that you do not become upset or annoyed (aequanimitas, from aequo animo )