Unsynthetic refers to something that is natural or not man-made. There are numerous synonyms that can be used interchangeably with this term. Some of the commonly used synonyms include organic, genuine, pure, real, authentic, original, unadulterated, unmixed, and natural. Other synonyms that can be used include unartificial, unsophisticated, unrefined, unprocessed, and raw, among others. All these synonyms denote the absence of artificiality or the man-made aspect. They are typically used to describe things such as food, products, and materials that are free from synthetic or artificial substances. Using these synonyms can help you to be more specific and descriptive in your communication.