Antonyms for the phrase "in a class by itself" include terms such as mediocre, average, ordinary, and unexceptional. These words describe something that is not unique, outstanding, or exceptional in any way. The opposite of being in a class by itself could also be described as being typical, common or run-of-the-mill. These antonyms suggest that something or someone does not stand out from the crowd, but rather blends in with others. In contrast, being in a class by itself implies that something is one-of-a-kind, incomparable, and impressive. It is a phrase frequently used to commend those individuals, places or things that are unparalleled in their field.