Толковый словарь английского языка Oxford English Reference - conscientious

adj. (of a person or conduct) diligent and scrupulous. Phrases and idioms conscientious objector a person who for reasons of conscience objects to conforming to a requirement, esp. that of military service. Derivatives conscientiously adv. conscientiousness n. Etymology: F consciencieux f. med.L conscientiosus (as conscience)