from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Guided by or in accordance with the dictates of conscience; principled: a conscientious decision to speak out about injustice.
  • adj. Thorough and assiduous: a conscientious worker; a conscientious effort to comply with the regulations.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Thorough, careful, or vigilant; implies a desire to do a task well.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Influenced by conscience; governed by a strict regard to the dictates of conscience, or by the known or supposed rules of right and wrong; -- said of a person.
  • adj. Characterized by a regard to conscience; conformed to the dictates of conscience; -- said of actions.

from The Century Dictionary and Cyclopedia

  • Conscious.
  • Controlled by conscience; governed by a strict regard to the dictates of conscience, or by the known or supposed rules of right and wrong: as, a conscientious judgė.
  • Regulated by conscience; according to the dictates of conscience; springing from conscience: as, a conscientious scruple.
  • Synonyms and Scrupulous, exact, careful, faithful, upright, honest, honorable, righteous.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. guided by or in accordance with conscience or sense of right and wrong
  • adj. characterized by extreme care and great effort


Obsolete French conscientieux, from Medieval Latin cōnscientiōsus, from Latin cōnscientia, conscience; see conscience.
(American Heritage® Dictionary of the English Language, Fourth Edition)


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