Entry 1 sense Webster, 1913 Conscientiously /känˌ-chē-ĕn'-chəs-lē/ · Con·sci·en·tious·ly · IPA /kˌɑntʃiːˈɛntʃəsliː/ 01 adv. In a conscientious manner; as a matter of conscience; hence; faithfully; accurately; completely. 1. In a conscientious manner; as a matter of conscience; hence; faithfully; accurately; completely.