When it comes to describing a concept or idea that has been reduced to its most basic elements, the term "overly simplified" is often used. However, there are many other synonyms that can be used in its place. For example, you could describe something as "too basic," "too easy," or "too superficial." You might also say that it has been "dumbed down," "condensed," or "distilled." Other synonyms for overly simplified could include "reductive," "abridged," or "abbreviated." Ultimately, the key is to choose a descriptor that accurately captures the level of simplification without becoming too pejorative or dismissive.