Volubilities refer to the quality of possessing a smooth and continuous flow of speech. The opposite of this quality would be to lack this fluency and coherence while speaking. Therefore, antonyms for volubilities could include words such as reticence, hesitation, shyness, and silence. These terms indicate a lack of confidence and comfort while communicating with others, resulting in a fragmented and halting delivery. Other antonyms for volubilities may encompass more negative connotations that suggest reluctance, aloofness, or a disinterest in participating in conversation. In any case, it is useful to be aware of these antonyms as they provide a vocabulary to describe the nuances of communication styles.