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The Collaborative International Dictionary
Unexpressible

Unexpressible \Un`ex*press"i*ble\, a. Inexpressible.
--Tillotson. -- Un`ex*press"i*bly, adv.

Wiktionary
unexpressible

a. Impossible to express.

WordNet
unexpressible

adj. defying expression [syn: inexpressible] [ant: expressible]