Definify.com

Webster 1913 Edition

Adj.

Inexpressible.

Tillotson.

–

Unˊex-press′i-bly

adv.

Adj.

That cannot be expressed. [But inexpressible is the word now used.]

unexpressible ‎(comparative more unexpressible, superlative most unexpressible)

Impossible to express.
(Can we find and add a quotation of Tillotson to this entry?)