PERTINACIOUS

_{[per-tuh-NAY-shus]}

The pertinacious reporter refused to drop the investigation, following leads for months until she finally uncovered the truth about the corporate scandal.

(adjective) Someone who is stubbornly persistent or determined, often to the point of being unyielding. It refers to holding firmly to a purpose, belief, or course of action, sometimes even in the face of opposition or difficulty.