The Collaborative International Dictionary
Unconscionable \Un*con"scion*a*ble\, a.
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Not conscionable; not conforming to reason; unreasonable; exceeding the limits of any reasonable claim or expectation; inordinate; as, an unconscionable person or demand; unconscionable size.
Which use of reason, most reasonless and unconscionable, is the utmost that any tyrant ever pretended.
--Milton.His giantship is gone somewhat crestfallen, Stalking with less unconscionable strides.
--Milton. -
Not guided by, or conformed to, conscience. [Obs.]
Ungenerous as well as unconscionable practices.
--South. [1913 Webster] -- Un*con"scion*a*ble*ness, n. -- Un*con"scion*a*bly, adv.
Wiktionary
n. The quality of being unconscionable.
Usage examples of "unconscionableness".
Therefore are they grieved, whensoever they hear themselves charged, either of injustice, or unconscionableness, or covetousness, or in general, of any injurious kind of dealing towards their neighbours.