Source : Webster's Revised Unabridged Dictionary (1913)

Conscientious \Con`sci*en"tious\, a. [Cf. F. consciencieux, LL.
   conscientiosus.]
   1. 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.

            The advice of wise and conscientious men.
                                                  --Prescott.

Source : WordNet®

conscientious
     adj 1: characterized by extreme care and great effort;
            "conscientious application to the work at hand";
            "painstaking research"; "scrupulous attention to
            details" [syn: {painstaking}, {scrupulous}]
     2: guided by or in accordance with conscience or sense of right
        and wrong; "a conscientious decision to speak out about
        injustice" [ant: {unconscientious}]