父亲认真英语怎么说呢

"父亲认真"可以用"diligent father"来表示。
Diligent这个词来源于拉丁文"diligentia"，意思是勤奋、用心。Father 是指父亲。
例句:
My father is always diligent in his work. 我父亲总是在工作中很勤奋。
The diligent father made sure his children got the best education. 这位认真的父亲确保他的孩子得到最好的教育。
Despite his busy schedule, he remained a diligent father, always finding time to spend with his family. 尽管他的日程非常紧张，但他仍然是一位认真的父亲，总能找时间和家人在一起。