conscientious

Meanings

1. 1
   adj

   characterized by extreme care and great effort

   conscientious application to the work at hand

2. 2
   adj

   guided by or in accordance with conscience or sense of right and wrong

   a conscientious decision to speak out about injustice

3. 3
   adj

   Thorough, careful, or vigilant in one’s task performance; painstaking.

   He was a thoughtful and conscientious worker.

4. 4
   adj

   Influenced by conscience; principled; governed by a strict regard to the dictates of conscience, or by the known or supposed rules of right and wrong (said of a person).

   The advice of wise and conscientious people.

Etymology

From Middle French conscientieux, from Medieval Latin cōnscientiōsus. Its English equivalent could possibly be analyzed as conscient + -ous. See more at conscience.