assiduously
🇺🇸
/əˈsɪdʒuəsli/
🇬🇧
/əˈsɪdʒuəsli/
working very hard and carefully
He worked assiduously to earn the money for his son’s education.
그는 아들의 교육을 위해 돈을 벌기 위해 부지런히 일했다.