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From The Collaborative International Dictionary of English v.0.48:
Unconscionable \Un*con"scion*a*ble\ ([u^]n*k[o^]n"sh[u^]n*[.a]*b'l), a. 1. Not conscionable; exceeding the limits of any reasonable claim or expectation; not conforming to reason; unreasonable; inordinate; extravagant; as, an unconscionable person or demand; unconscionable size. [1913 Webster] Which use of reason, most reasonless and unconscionable, is the utmost that any tyrant ever pretended. --Milton. [1913 Webster] His giantship is gone somewhat crestfallen, Stalking with less unconscionable strides. --Milton. [1913 Webster] 2. Not guided by, or conformed to, conscience; that cannot be done in good conscience; as, unconscionable profits. [1913 Webster +PJC] Ungenerous as well as unconscionable practices. --South. [1913 Webster] -- Un*con"scion*a*ble*ness, n. -- Un*con"scion*a*bly, adv. [1913 Webster]