equable
/ˈekwəbl; `ɛkwəbl/ adj
1 free from extremes of heat or cold; moderate 冷热适中的; 温和的
an equable climate 温和的气候.
2 (of a person) not easily upset or annoyed; even-tempered （指人）不易恼怒的, 性情温和的
an equable temperament 温和的性情
It's lucky that his parents are so equable. 值得庆幸的是他双亲性情非常温和.