singlehearted
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Singleness of heart — (also called singleheartedness) is the ideal of having sole devotion to a task or endeavour. It is normally employed in a religious or spiritual context. In antiquity it was thought of as a counteraction to the divisive effects of civilization on … Wikipedia
faithful — I (diligent) adjective assiduous, attentive, careful, conscientious, constant, dogged, exacting, fidelis, fidus, indefatigable, industrious, laborious, meticulous, mindful, painstaking, particular, persevering, persistent, pertinacious,… … Law dictionary