The word "bulgiest" is an adjective that describes something that is large and protruding. Antonyms for this word would include "slimmest," "thinnest," "narrowest," "smallest," "flat," and "compact." These words describe things that are small, streamlined, or lacking in bulk. For example, a slim person would be the antithesis of someone who is bulgiest. Similarly, a small, compact car would be the opposite of a bulky, oversized truck. Antonyms for bulgiest can be used to describe things that are more subtle, unobtrusive, or efficient.