Conscientious

adjective/ˌkɑn.ʃiˈɛn.ʃəs/character

Definition

Wishing to do what is right, especially to do one's work or duty well and thoroughly. Also: conscientiousness (n).

Etymology

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

Synonyms

faithful

In a sentence

A conscientious engineer who never ships without tests.

Conscientiousness