Antonyms of adj utterable

1 sense of utterable

Sense 1
speakable, utterable -- (capable of being uttered in words or sentences)

INDIRECT (VIA expressible) -> inexpressible, unexpressible -- (defying expression)

Similarity of adj utterable

1 sense of utterable

Sense 1
speakable, utterable -- (capable of being uttered in words or sentences)
       => expressible (vs. inexpressible) -- (capable of being expressed; "an expressible emotion")