When it comes to negotiating deals, you may find yourself using the term "last offer" frequently. However, there are several synonyms you can use to make your negotiation sound more professional and sophisticated. For example, you could say "final proposal," "closing bid," or "endgame offer." Other options include "concluding proposition," "ultimate proposal," or "last-ditch attempt." Of course, the most important thing is to ensure that your last offer is compelling and well-prepared, no matter what you call it. Make sure to do your research and clearly communicate your value proposition to make a strong impression.