Undistinguishably is a word that means "unable to be told apart." There are several synonyms for undistinguishably, including indistinguishably, inseparably, identically, homogeneously, and uniformly. These words all describe things that are alike in some way and cannot be distinguished from one another. Indistinguishably is the most common synonym for undistinguishably, but it's worth noting that each of these words can have slightly different connotations depending on the context in which they are used. Regardless of which synonym you choose to use, all of these words can be used to describe things that are difficult to tell apart from one another.