Which Martini has no vermouth at all?

The Extra Dry Martini is characterized by its minimal use of vermouth. In fact, it can be made with just a wash or a rinse of vermouth, making the gin or vodka the dominating flavor. This distinction is significant because it emphasizes the purity of the base spirit, showcasing the flavor of the gin or vodka more prominently than in other types of Martinis.

In contrast, the Regular Martini features a standard measure of vermouth, while the Dry Martini contains less vermouth compared to a regular formulation. The Perfect Martini involves equal parts of sweet and dry vermouth, making it richer in vermouth flavor rather than devoid of it. Therefore, the Extra Dry Martini stands out as the option that typically involves little to no vermouth, aligning perfectly with the classification that defines it.