The word "most tarnished" refers to something that is severely damaged or discredited. A few possible antonyms for this word include "pristine," which means something that is unspoiled or immaculate, or "flawless," indicating a quality that is entirely without blemish. "Untarnished" suggests something that has not yet been stained or sullied, while "pure" refers to a quality that is untainted or uncorrupted. "Unblemished," "unmarred," and "impeccable" are also potential antonyms for the phrase "most tarnished," all conveying a sense of excellence, purity, and perfection that is the polar opposite of tarnish or damage.