Oversimple is a word that is commonly used to describe something that is too simplistic or basic. There are a number of synonyms for this word that can be used to convey the same meaning. Some of these synonyms include simplistic, superficial, uncomplicated, elementary, crude, rudimentary, and unsophisticated. Each of these words can be used to describe something that is lacking in complexity or sophistication. Whether you are describing a concept, an idea, or a system, these synonyms can help you to convey the idea that it is too basic and not sufficiently developed or refined. By using these words, you can help to convey your ideas more effectively to your audience.