The antonyms for the phrase "were dissimilar" are "were alike," "were similar," and "were identical." These words convey the exact opposite meaning of "were dissimilar" and suggest that two or more things or objects share common characteristics, features, or qualities. For instance, two paintings could be "similar" in terms of their color scheme, composition, and subject matter. Similarly, two identical twins could be "alike" in their appearance, behavior, and mannerisms. By using antonyms, we can expand our vocabulary and express our thoughts and ideas more precisely and effectively.