Un-utterable means something that cannot be expressed in words. Antonyms for un-utterable include "expressible," "utterable," "articulate," "coherent," "intelligible," and "comprehensible." When something is expressible or utterable, it means it can be easily communicated or spoken. On the other hand, when something is unutterable, it is usually associated with something that is overwhelming or indescribable, like an emotion or experience. By using antonyms of unutterable, you can better articulate your thoughts and feelings and convey them to others in a more precise and coherent way.