consciencieux in English:

A conscientious teacher may feel inclined to take work home.

I'm conscientious - I always do my homework.

However, for conscientious MEPs and those in the non-attached group, it is a nightmare.

Though Alfred is scrupulous in fulfilling his duties at work, he is less conscientious about his obligations at home.

I'm diligent but not always conscientious. Sometimes I complete task inaccurate and in a slipshod manner

a conscientious worker

She's a conscientious judge, who does not let personal prejudices influence her decisions

He's maybe not our brightest employee, but certainly a conscientious one.

In either case he always answered them, for he was conscientious.

Sharon works very hard and is conscientious.

Miss Dorota is the most conscientious worker in our company.

I know we can rely on them to get the job finished on time. They are very conscientious.

She's so conscientious-she learns everyday!

She's very thorough and conscientious. / a conscientious student/teacher/worker

At the end, the conscientious girl gave up with her English homework, and started to revise her list of Ainu words.