The antonyms for the word "most unspeaking" are "communicative," "talkative," "vocal," and "expressive." Someone who is communicative is able to communicate and express their thoughts and feelings effectively. A talkative person talks a lot, often without much prompting or encouragement. A vocal person may be outspoken or have a strong voice or opinions. An expressive individual can convey their feelings and emotions through various means, such as body language, art, or writing. These antonyms represent people who are the opposite of "most unspeaking," or those who are generally quiet or unable to express themselves well.