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Webster 1913 Edition

Adj.

Unconscionable.

[Obs.]

Spenser.

Adj.

Having no sense of good and evil.

inconscionable ‎(comparative more inconscionable, superlative most inconscionable)

(rare) Obsolete form of unconscionable.
(Can we find and add a quotation of Spenser to this entry?)

inconscionable in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913