"Dead set on" is a commonly used phrase that means someone is determined to do or achieve something. However, if you're looking to add some variety to your vocabulary, there are plenty of synonyms you can use instead of "dead set on." Some examples include "hell-bent on," "stubbornly committed to," "devotedly pursuing," "resolute about," "fixed on," and "adamant about." These word choices can help add emphasis and variety to your writing or speech. Remember, choosing the right word is critical to communicating your message effectively. So, experiment with different synonyms to avoid being repetitive and keep your language fresh and engaging.