The word "more plagiarized" implies that an object, idea or work has been further copied or stolen. To describe the opposite of this, one would need to use an antonym that suggests originality or authenticity. Examples of such antonyms include 'original', 'innovative', 'creative', 'authentic', 'genuine' and 'unique.' Each of these words suggests that something has not been copied or stolen from other sources, but rather, it is a distinct creation. Using these antonyms to describe something indicates that a particular work is unique or authentic, rather than a reproduction or imitation of existing material.