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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 conscientiously
Contemporary Examples
Historical Examples
  • When an opportunity offered, he rested them conscientiously.

    The Secret Agent Joseph Conrad
  • It was a beauty prize that the jury had conscientiously awarded to Marie Lloyd.

    My Double Life Sarah Bernhardt
  • She was working on it silently and conscientiously, ironing the puffs and insertions.

    L'Assommoir Emile Zola
  • "This is the smoking-room," said Eric, conscientiously firm and unimpressed.

    The Education of Eric Lane Stephen McKenna
  • Women have voted as universally and as conscientiously as men.

  • "No, you are anything but that," declared Mr. Travers, conscientiously.

    The Rescue Joseph Conrad
  • "I don't mean to say that they were exactly pleased," broke in Lingard, conscientiously.

    The Rescue Joseph Conrad
British Dictionary definitions for conscientiously


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 conscientiously



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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