The word "gossamery" describes something that is light, delicate, and almost weightless. Its antonyms are words that describe something that is heavy, substantial, and solid. Those words include robust, sturdy, firm, substantial, thickset, and well-built. More specifically, the antonyms for "more gossamery" are anything that opposes its lightness and weightlessness, such as substantial, massive, or heavy. These antonyms convey a sense of solidity and groundedness, which is the opposite of the ethereal and delicate nature of something that is gossamery. Overall, antonyms for "more gossamery" emphasize materiality and physical existence, rather than something that is ethereal or light.