The phrase "most oldworld" refers to something that is traditional, ancient or reminiscent of a bygone era. Some antonyms for "most oldworld" would include modern, contemporary or futuristic. These words suggest a break from the past and a move towards new possibilities. Other antonyms include advanced, revolutionary, and innovative, all of which suggest a trend towards progress and sophistication. Alternatively, synonyms like newfangled, novel, or revolutionary signify a fresh and modern approach. So, depending on the context, one can use a range of antonyms to transform the connotation of "most oldworld" and describe something that is cutting-edge, futuristic, and in tune with the present-day world.