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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. 2018.
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Examples from the Web for conscientious
Contemporary Examples
Historical Examples
  • In all this he has been upright, disinterested and conscientious in word and deed.

    The Grand Old Man Richard B. Cook
  • By common consent he was pre-eminently God-fearing, orderly and conscientious.

    The Grand Old Man Richard B. Cook
  • For he was conscientious and must open shop with a fresh supply each day.

    Pee-wee Harris Percy Keese Fitzhugh
  • He was a most conscientious man, and whatever he undertook to do, he did thoroughly.

    Self-Help Samuel Smiles
  • His landscapes were conscientious and excellent in intent, but his real passion was music.

    A Zola Dictionary J. G. Patterson
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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