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 ]