The antonyms for the word "crossfertilizes" are "isolates," "separates," "divides," "disconnects," "dissociates," and "differentiates." These words imply the opposite meaning of crossfertilization, which is the process of combining different ideas, concepts or elements to create something new and innovative. For instance, when we talk about isolates, we refer to things that are set apart from others, which means they are not cross-blended with anything else. Similarly, when we talk about dissociates, we mean things that are disconnected and not blended with other factors. Overall, antonyms for crossfertilizes connote the idea of separateness and distinctness rather than connectivity and blending.