The word "most rubbishy" means something that is of extremely poor quality or value. Some antonyms for this term could be "excellent," "outstanding," "superb," "top-notch," or "high-quality." These words describe items or objects that are considered to be the best of their kind, and are typically praised for their exceptional performance, appearance, or overall value. Other antonyms that could be used include "first-rate," "flawless," "impeccable," or "perfect." These opposing terms are often used to express the opposite of something that is considered to be of low quality or value, highlighting the stark contrast between the two.