"Straightbred" is a term often used in the context of animals, particularly livestock breeding. It refers to animals that are purebred or bred from a pure lineage, without any crossbreeding. However, there are several synonyms for the term "straightbred" that can be used interchangeably to convey the same meaning. These synonyms include "purebred", "thoroughbred", "pedigreed", "unsullied", "unadulterated", and "highbred". All these words imply that the animal is of a specific and pure lineage, maintaining the desirable characteristics of its breed. So, whether you are discussing animal breeding or purity in general, these synonyms effectively convey the concept of "straightbred."