Webster's Revised Unabridged Dictionary · 1913

Unconscionable

Unconscionable (un*kon"shun*ȧ*b'l) , adjective

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.
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
2.
Not guided by, or conformed to, conscience; that cannot be done in good conscience; as, unconscionable profits.
Ungenerous as well as unconscionable practices. — South