Unsimilar means not similar, but what are the opposite words for this term? The antonyms for unsimilar are alike, similar, analogous, and uniform. When two things are alike, they share common attributes, properties, or characteristics, while similar refers to things that are almost the same or closely resemble one another. Analogous refers to items that share different but relevant aspects or features. Uniform means things that are the same in shape, size, or quality, which is the opposite of unsimilar where items differ from one another. These antonyms allow individuals to compare and differentiate between similar and unsimilar objects.