There are several synonyms for the word "not uttered" that can be used to convey the same meaning. Some of these include unspoken, unsaid, unexpressed, unvoiced, tacit, silent, mute, and unarticulated. Each of these words implies that something has been intentionally or unintentionally left unsaid or not spoken aloud. When it comes to communication, sometimes what is not said can be just as important as what is said. Therefore, understanding these synonyms for "not uttered" can help to improve one's ability to express themselves effectively and to recognize and interpret nonverbal cues in others.