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Webster 1913 Edition

Adj.

Inexpressible.

[R.]

Without expression or meaning; not expressive; dull; unintelligent;

as, an

inexpressive

countenance

Adj.

Not tending to express; not expressing; inexpressible.

inexpressive ‎(comparative more inexpressive, superlative most inexpressive)

lacking expression

inexpressive