[kon-shee-en-shuhs, kon-see-]


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 formscon·sci·en·tious·ly, adverbcon·sci·en·tious·ness, nounhy·per·con·sci·en·tious, adjectivehy·per·con·sci·en·tious·ly, adverbhy·per·con·sci·en·tious·ness, nouno·ver·con·sci·en·tious, adjectiveo·ver·con·sci·en·tious·ly, adverbun·con·sci·en·tious, adjectiveun·con·sci·en·tious·ly, adverbun·con·sci·en·tious·ness, noun

Synonyms for conscientious Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unconscientious

Historical Examples of unconscientious

  • Often, unconscientious pleasure-seekers roam the roads in their auto.


    Henry Stanton

  • That woman ought not to be at large—so rich and good-looking and unconscientious!

    A Cathedral Courtship

    Kate Douglas Wiggin

  • Yet it is one of the most unconscientious diaries ever written.

    Sophy of Kravonia

    Anthony Hope

  • I trust that you have given me credit, Mr. Gammon, for offering no vexatious or unconscientious obstacles.

  • Nay, but God forbid that any unconscientious advantage should be taken on my behalf!

British Dictionary definitions for unconscientious



involving or taking great care; painstaking; diligent
governed by or done according to conscience
Derived Formsconscientiously, adverbconscientiousness, 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

Word Origin and History for unconscientious



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