The word re-duplicated refers to something that has been repeated or duplicated again. Its antonyms would thus relate to uniqueness or singularity, such as singular, original, unique, exclusive, or individual. Alternatively, it could also refer to something that was not repeated or duplicated, such as unreplicated, unduplicated, or unrepeated. These antonyms would connote a sense of singularity and originality, implying that something exists without any copies or repetitions. In contrast, the term re-duplicated implies that there has been some form of replication or repetition. By understanding the antonyms of re-duplicated, we can diversify our vocabulary and communicate with more precision.