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1. Guided by or in accordance with the dictates of conscience; principled: a conscientious decision to speak out about injustice.
2. Thorough and assiduous: a conscientious worker; a conscientious effort to comply with the regulations. See Synonyms at diligent.

[Obsolete French conscientieux, from Medieval Latin cōnscientiōsus, from Latin cōnscientia, conscience; see conscience.]

con′sci·en′tious·ly adv.
con′sci·en′tious·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. involving or taking great care; painstaking; diligent
2. governed by or done according to conscience
ˌconsciˈentiously adv
ˌconsciˈentiousness n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌkɒn ʃiˈɛn ʃəs, ˌkɒn si-)

1. meticulous; careful; painstaking.
2. governed by or done according to conscience; scrupulous: a conscientious judge.
[1605–15; < Medieval Latin]
con`sci•en′tious•ly, adv.
con`sci•en′tious•ness, n.
syn: See painstaking.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


1. 'conscious'

Conscious is an adjective. If you are conscious of something, you are aware of it.

She became conscious of Rudolph looking at her.
I was conscious that he had changed his tactics.

If you are conscious, you are awake, rather than asleep or unconscious.

The patient was fully conscious during the operation.
2. 'consciousness'

Consciousness is a noun. You can refer to your mind and thoughts as your consciousness.

Doubts were starting to enter into my consciousness.

If you lose consciousness, you become unconscious. If you regain consciousness or recover consciousness, you become conscious again after being unconscious. These are fairly formal expressions.

He fell down and lost consciousness.
He began to regain consciousness just as Kate was leaving.
She died in hospital without recovering consciousness.

In more informal English you can say that you pass out instead of 'lose consciousness', and come round instead of 'regain/recover consciousness'.

He felt sick and dizzy, then passed out.
When I came round, I was on the kitchen floor.
3. 'conscience'

Conscience is a noun. Your conscience is the part of your mind that tells you whether what you are doing is right or wrong.

My conscience told me to vote against the others.
Their consciences were troubled by stories of famine and war.
4. 'conscientious'

Conscientious is an adjective. Someone who is conscientious is very careful to do their work properly.

We are generally very conscientious about our work.
She seemed a conscientious, serious young woman.
Collins COBUILD English Usage © HarperCollins Publishers 1992, 2004, 2011, 2012
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.conscientious - characterized by extreme care and great effort; "conscientious application to the work at hand"; "painstaking research"; "scrupulous attention to details"
careful - exercising caution or showing care or attention; "they were careful when crossing the busy street"; "be careful to keep her shoes clean"; "did very careful research"; "careful art restorers"; "careful of the rights of others"; "careful about one's behavior"
2.conscientious - guided by or in accordance with conscience or sense of right and wrong; "a conscientious decision to speak out about injustice"
unconscientious - not conscientious;
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002
حَيُّ الضَّمِيرقائِمٌ بِواجِبِهِ عَلى الوَجْه الأكْمَل
tận tâm


A. ADJconcienzudo
B. CPD conscientious objector Nobjetor(a) m/f de conciencia
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


[ˌkɒnʃiˈɛnʃəs] adj
(= hard-working) → consciencieux/euse
[scruple, objection] → de conscience
Collins English/French Electronic Resource. © HarperCollins Publishers 2005


(= diligent)gewissenhaft; (= conscious of one’s duty)pflichtbewusst
(Mil) he refused to go as a conscientious objectioner weigerte sich aus Gewissensgründen hinzugehen ? conscientious objector
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


[ˌkɒnʃɪˈɛnʃəs] adjcoscienzioso/a
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995


(konʃiˈenʃəs) adjective
careful and hard-working. a conscientious pupil.
ˌconsciˈentiously adverb
ˌconsciˈentiousness noun
ˌconscientious obˈjector noun
a person who refuses to serve in the armed forces for moral or religious reasons.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.


حَيُّ الضَّمِير svědomitý samvittighedsfuld gewissenhaft ευσυνείδητος concienzudo tunnollinen consciencieux savjestan coscenzioso 念入りな 양심적인 consciëntieus samvittighetsfull sumienny escrupuloso сознательный samvetsgrann ที่ทำด้วยความรู้สึกในด้านดี vicdanlı tận tâm 尽责的
Multilingual Translator © HarperCollins Publishers 2009
References in periodicals archive ?
A series of scandals regarding homophobic, anti-Semitic and racist remarks left the star "( persona non grata " in Hollywood until his return earlier this year with "Hacksaw Ridge," a World War Two&nbsp;film about the first consciencious objector to win the Congressional Medal of Honor.
We need young fit men who are consciencious and his condition is now much better.
Williams's opposition to coercion reflected an indignation that those who speak "'so tenderly for [their] owne, hath yet so little respect, mercie, or pitie to the like consciencious perswasions of other Men.'" (10) "'I commend,'" he wrote, "'that Man whether Jew or Turke, or Papist, or who ever that steeres no otherwise then his Conscience dares ...
Fortunately, the legal edifice in civilized countries rests on such solid pillars, and it has originated such a high intellectual and spiritual level that, no matter how difficult and novel is the attempt to adapt so old principles to so new problems, it will always be possible to reach satisfactory results, if the scholar and the professional lawyer in general are consciencious [sic] enough to accept the task of creating this new and special legal structure, so that the system of norms and principles of equity and justice, necessary for this new source of energy to yield its benefits and cease to be a danger, would be developed in the fields of private, public and, above all, international law.
Arwel Wyn Jones, who was married and had three sons, was described yesterday by a friend as a very consciencious worker.