Earnest people are very serious and sincere in what they say or do, because they think that their actions and beliefs are important.
Catherine was a pious, earnest woman.
凯瑟琳是位虔诚、真挚的女子。
in earnest
If something is done or happens in earnest, it happens to a much greater extent and more seriously than before.
Campaigning will begin in earnest tomorrow.
活动明天正式开始。