conscientiousa.[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.)()2. Characterized by a regard to conscience; conformed to the dictates of conscience; -- said of actions.()A holy and conscientious course. (Abp. Tillotson.)()