The word "Frankensteinian" is typically used to describe something or someone that is monstrous, unnatural, or grotesque. However, there are several synonyms that could be used to describe the same concept. For instance, the term "ghoulish" is often used to describe something that is reminiscent of a corpse or other undead creature. Similarly, the word "macabre" refers to something that is eerie, grim, or unsettling. And the word "monstrous" itself could also be used to convey the same sense of unnaturalness or grotesqueness. Ultimately, the choice of synonym depends on the context and intended meaning of the word "Frankensteinian".