The antonyms for the word "most unacknowledged" can be "well-known," "celebrated," or "acknowledged." These words signify that the subject or object is widely recognized, appreciated, or acclaimed. The antonyms of "most unacknowledged" can also be "celebrity," "famous," and "popular." These words represent a person, achievement, or entity that has gained significant recognition and appreciation from the public. Likewise, the antonyms can be "respected," "admired," or "praised," implying that the subject or object is esteemed and held in high regard by others. In summary, the antonyms of "most unacknowledged" represent what is known, appreciated, praised, and celebrated.