Antonyms for "being similar to" include words that indicate differences or contrasts. Some of these words are "opposite," "dissimilar," "unlike," "different," "uncommon," "diverse," and "varying." Using antonyms can enrich our language and improve our communication skills by allowing us to express nuances in meaning with precision. By choosing the right antonym, we can convey the exact opposite of "being similar to" and create a more vivid image in the listener's mind. For example, instead of saying two things are "similar," we could say they are "dissimilar," indicating a marked difference in quality or character.