earnest (真剣な): He made an earnest effort to improve his grades. (彼は成績を向上させるために真剣な努力をしました) - 試験に出る! 英単語検索辞書

earnest (真剣な): He made an earnest effort to improve his grades. (彼は成績を向上させるために真剣な努力をしました)

He made an earnest effort to improve his grades.