The word "repro" is not commonly used in the English language, but its antonyms could be helpful in understanding its meaning. Repro is an abbreviation for "reproduction," and its antonyms will relate to different aspects of this word. The antonym for "repro" as in "reproach" could be "praise" or "commendation." If we talk about "repro" as in "reproduction," an antonym could be "original" or "unique." Similarly, if we use the word "repro" in the context of "printing," the antonym could be "original" or "one-of-a-kind." The antonyms for "repro" will depend on the context in which the word is used.