Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: French
Origin: conscientieux, from Medieval Latin, from Latin conscientia; CONSCIENCE

conscientious

 adjective
     
con‧sci‧en‧tious
careful to do everything that it is your job or duty to do:
A conscientious teacher may feel inclined to take work home.
a conscientious and hard-working student
—conscientiously adverb
—conscientiousness noun [uncountable]
his conscientiousness and loyalty to the company
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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