Most miniaturized means the smallest or most compact form of something. Antonyms for this word could include largest, biggest, or full-sized. Other antonyms could be expansive, spacious, or spread out. When discussing technology or electronics, some antonyms for most miniaturized might include clunky, bulky, or cumbersome. In terms of design or artwork, opposite words could be exaggerated, oversized, or grandiose. It all depends on the context in which most miniaturized is being used, but antonyms can be useful to describe something that is not small or compact.