Antonyms for the word "most ginormous" can include "tiny," "scrawny," "wee," "minuscule," "microscopic," "little," "small," "insignificant," "petite," "diminutive," and "undersized." These words are opposites to the term "most ginormous," which refers to something that is exceptionally large or immense. Using antonyms in writing or speaking can provide a more diverse range of vocabulary and add contrast to language. By using the right antonyms, one can easily describe or depict something that is of the opposite nature to the intended concept or idea.