unswerving

going directly ahead from one point to another without veering or turning aside; "some people see evolution as an undeviating upward march from simple organisms to the very complex"; "a straight and narrow tree-lined road unswerving across the lowlan

अपना स्थान पक्का करने और अपनी धन-दौलत की रक्षा के लिए उन्होंने फौज रखना आरंभ किया।

He has unswerving loyalty to his master.