utterable

utter +‎ -able

utterable (not comparable)

1. Capable of being expressed in words, especially audibly.

   Antonym: unutterable

   • 1917 April, Jack London, chapter XX, in Jerry of the Islands, New York, N.Y.: The Macmillan Company, →OCLC, page 281:

     In his vocabulary was no word for "crocodile"; yet in his thought, as potent as any utterable word, was an image of dreadful import— [...]

• unutterable

• utterability

• Oxford English Dictionary, 2nd ed., 1989.