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[kon-shee-en-shuh s, kon-see-] /ˌkɒn ʃiˈɛn ʃəs, ˌkɒn si-/
governed by conscience; controlled by or done according to one's inner sense of what is right; principled:
She's a conscientious judge, who does not let personal prejudices influence her decisions.
careful and painstaking; particular; meticulous; scrupulous:
conscientious application to the work at hand.
Origin of conscientious
1605-15; < Medieval Latin conscientiōsus, equivalent to Latin conscienti(a) conscience + -ōsus -ous
Related forms
conscientiously, adverb
conscientiousness, noun
hyperconscientious, adjective
hyperconscientiously, adverb
hyperconscientiousness, noun
overconscientious, adjective
overconscientiously, adverb
unconscientious, adjective
unconscientiously, adverb
unconscientiousness, noun
1. just, upright, honest, faithful, devoted, dedicated. 2. See painstaking. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for conscientious
  • conscientious, ethical journalists from all media and specialties strive to serve the public with thoroughness and honesty.
  • Being an informed and conscientious citizen is important.
  • Some instructors are conscientious in evaluating students' papers and providing constructive feedback.
  • Encounter cultural diversity while remaining a conscientious and responsible traveler.
  • Some are conscientious professionals who help provide research cadavers.
  • It becomes harder to distinguish between conscientious job-seekers and dilatory ones.
  • And older workers may cost more but they are often more conscientious and their experience is valuable.
  • Most people would say they are environmentally conscientious.
  • He tried to get out of the military as a conscientious objector after that.
  • For one thing, you are so conscientious that you would let it absorb your whole energy.
British Dictionary definitions for conscientious


involving or taking great care; painstaking; diligent
governed by or done according to conscience
Derived Forms
conscientiously, adverb
conscientiousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for conscientious

1610s, from Middle French conscientieux (16c.; Modern French consciencieux), from Medieval Latin conscientiosus, from conscientia (see conscience). Related: Conscientiously; conscientiousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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