Gumminess is a texture property that describes the degree of stickiness and elasticity of a substance. Antonyms for the word "more gummous" could include "less sticky," "more solid," "stiff," "unyielding," "crispy," "firm," "hard," "brittle," "dry," "flaky," "powdery," and "powdery." These antonyms are used to describe substances that lack the properties of being sticky and elastic, such as dry crackers, crisp vegetables, and powdery substances. Therefore, the antonyms for the word "more gummous" are words that describe the opposite of its meaning.