The word "unbeheld" means something that is not seen or observed. Some synonyms for "unbeheld" include "unnoticed," "unseen," "invisible," "hidden," and "unacknowledged." These words all convey the idea of something that is present but not easily noticed or perceived. Other possible synonyms for "unbeheld" might include "unattended," "unremarked," or "unheard." Depending on the specific context in which the word is being used, different synonyms for "unbeheld" may be more appropriate or effective. For instance, in a philosophical or metaphysical discussion, "invisible" or "hidden" might be more fitting than "unacknowledged" or "unnoticed".