认真用英语可以翻译为：demure，douce，sadd，serious，serious-minded，serious-minded和staid。短语：take ... seriously; take ... for serious，对...认真。

认真的的英文：
demure
douce
sadd
serious
serious-minded
seriousminded
staid

相关短语：

take .. seriously; take .. for serious 对..认真

intense study 认真的研究

be assiduous in one's duties 认真执行任务

参考例句：

Eleanor was brus百思特网que and firm百思特网 and businesslike.
埃莉诺态度粗暴，意志坚定、办事认真。