Most anachronistic refers to something that is outdated, old-fashioned, or out of place in the current era or circumstance. Antonyms for most anachronistic could include modern, contemporary, current, up-to-date, and relevant. These words suggest the opposite of something that is obsolete or behind the times. Other antonyms could include progressive, advanced, cutting-edge, and innovative. These words evoke a sense of forward-thinking and staying ahead of the curve. Overall, antonyms for most anachronistic refer to something that is current, ahead of its time, and relevant to the current context.