imperturbable
adj
not easily troubled or worried; calm 不易受搅扰的; 不易发愁的; 冷静的
She was one of those imperturbable people who never get angry or upset. 她是那种从不生气也不烦恼的人.
Knowing that the industrious ant lives in a highly organized society does nothing to prevent us from being filled with revulsion when we find hordes of them crawling over a carefully prepared picnic lunch.