Q: earnestly とはどういう意味ですか?
A: It means seriously or sincerely. Example: He earnestly thanked the man who saved his life.
Q: earnestly とはどういう意味ですか?
A: To be sincere or to be seriously committed to doing something.
'She earnestly tried to finish her English homework before class began.'
'They earnestly hope to be back tomorrow.'


Q: earnestly を使った例文を教えて下さい。
A: She spoke earnestly about her beliefs.
It means to be serious and sincere.


Q: earnestly と seriously はどう違いますか?
A: I believe you've asked this before:

"earnestly is in an earnest manner; being very sincere; putting forth genuine effort while seriously is (manner) in a serious or literal manner."

Seriously is used far more often and has a wider range of meanings. I think the answer from 2018 is also good. I think "earnestly" is closer to "sincerely" in meaning but there are many situations in which the two overlap.
Q: earnestly と seriously はどう違いますか?
A: "Earnestly" has a nuance of "eagerly" or "willingly", while you could do something seriously without wanting to.

"Seriously" also has meanings other than "earnest" and is used more.
Q: earnestly と seriously はどう違いますか?
A: Earnest means heartfelt, honest
Serious is professional
Q: earnestly と honestly はどう違いますか?
A: Earnest is more sincere (tulus), whilst honest is simply honest (jujur)