Un-uttered is a word that refers to something that has not been spoken or expressed. There are several synonyms for this term, including unspoken, unvoiced, unsaid, unexpressed, and silent. All of these words imply a lack of verbal communication or expression. Unspoken and unvoiced are particularly useful when referring to thoughts or feelings that are not spoken aloud, while unsaid and unexpressed can also be used to describe ideas or opinions that have not been shared in writing or other forms of expression. Silent is a more general term that can be used to describe anything that is devoid of sound or communication.