gravely
adv. 严重地；严肃地；严峻地；沉重地
n. （Gravely）人名；（英）格雷夫利
例句
"I think I've covered that business more than adequately," he said gravely.
“我认为我已经把那件事搞得够详细的了，”他一脸严肃地说。
《柯林斯英汉双解大词典》
Both animals nodded gravely.
两只动物严肃地点头。
"Of course," the Dodo replied very gravely.
“当然了。”渡渡鸟非常严肃地回答。
