The antonym for "were diverse" can be expressed as "were uniform" or "were homogeneous." When something is uniform or homogeneous, it means that there is little or no variation or difference among the elements. For example, if a group of people has similar backgrounds, beliefs, and attitudes, they can be described as uniform or homogeneous, rather than diverse. Similarly, if a set of products or ideas has little variation in features or characteristics, it can be called a uniform or homogeneous set. In contrast to the concept of diversity, uniformity or homogeneity suggests a lack of variety or distinctiveness, which can limit creativity, innovation, and inclusivity.