There is no direct antonym for the word "augustnesses" as it is a plural noun that refers to the state or quality of being august. However, some possible antonyms for the individual qualities that may be associated with augustnesses could be insignificance, mediocrity, banality, ordinariness, unimpressiveness, commonality or infamy. These terms refer to the absence of those qualities and characteristics that typically make something august. For example, insignificance suggests a lack of importance or weight, while mediocrity implies mediocrity or averageness, and banality denotes a lack of originality or imagination. Ultimately, the opposite of augustness may depend on the context and specific qualities being referred to.