assiduously

assiduously/əˈsɪdʒuəsli/
in a way that involves working very hard and taking great care
He worked assiduously to earn the money for his son’s education.
You will certainly achieve nothing unless you study assiduously.
如不刻苦钻研，则将一事无成。
He liked beautiful women and courted them assiduously.
他喜欢美女，并且对她们大献殷勤。