Carbon copy is a common term used to refer to an identical or duplicate copy of something. However, there are several antonyms or opposite phrases that can be used to convey the opposite meaning. Some of the antonyms for carbon copy include original, one-of-a-kind, unique, individual, distinct, and singular. These words indicate that the item or object in question is not a copy, but rather an original or unique creation. Using antonyms to carbon copy can help to emphasize the distinctiveness and authenticity of something, rather than its similarity to something else.