effable
Able to be spoken of; able to be expressed.
archaic, uncommon
That take such shapes before me, that I see them; These effable and ineffable impressions Of the mysterious world, that come to me From the elements of Fire and Earth and Water, And the all-nourishing Ether!
And leave me unto mine, if they be dreams,
Where it comes from
From Latin effābilis (effor (“to utter”) + -able).
Adapted from the Wiktionary entry effable (CC BY-SA 4.0).