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：demuredoucesaddseriousserious-mindedseriousmindedstaid
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 brusque and firm and businesslike.埃莉诺态度粗暴，意志坚定、办事认真。