conscientious

形容词 conscientious:

1. characterized by extreme care and great effort
   同义词：painstaking, scrupulous
2. guided by or in accordance with conscience or sense of right and wrong

1. The janitor is very conscientious.
   那个管理员很认真。
2. He's changed into a conscientious worker.
   他已成为一个工作认真的人了。
3. We should be conscientious to our work.
   我们应该对工作负责。
4. She is a conscientious teacher.
   她是一个有责任心的教师。

con.sci.en.tious

adj.（形容词）
Guided by or in accordance with the dictates of conscience; principled:
本着良心的：由良心指引或与良心一致的；有原则的：
例句：
a conscientious decision to speak out about injustice.
本着良心决定说出不义之事

Thorough and assiduous:
负责的：周全的和勤勉的：
例句：
a conscientious worker; a conscientious effort to comply with the regulations.
谨慎的员工；全力与规定配合

来源：
Obsolete French conscientieux
已废法语 conscientieux
from Medieval Latin cônscientiôsus
源自 中世纪拉丁语 cônscientiôsus
from Latin cônscientia [conscience] * see conscience
源自 拉丁语 cônscientia [良心] *参见 conscience

【引伸】
con.scien.tiously
adv.（副词）
con.scien.tiousness
n.（名词）