When two things "are dissimilar," it means they are not alike. Some antonyms for this phrase include "are similar," "are alike," "resemble each other," or "have commonalities." These antonyms suggest a similarity or sameness between the two things in comparison. Other antonyms may be "are identical," which implies that the two things are exactly the same; "are equal," which suggests an equivalence between the two; or "are the same," which implies that there is no difference. However, it is important to note that antonyms are not always exact opposites, and context can shift their meaning.