Unconscionable

Un-con′scion-a-ble

(ŭn-kŏn′shŭn-ȧ-b’l)

,

Adj.

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.

Ungenerous as well as

unconscionable

practices.

South.

–

Un-con′scion-a-ble-ness

,

Noun.

–

Un-con′scion-a-bly

,

adv.

, a.

1.

Unreasonable; exceeding the limits of any reasonable claim or expectation; as an unconscionable request or demand.

2.

Forming unreasonable expectations. You cannot be so unconscionable as to expect this sacrifice on my part.

3.

Enormous; vast; as unconscionable size or strides. [Not elegant.]

4.

Not guided or influenced by conscience.

unconscionable ‎(comparative more unconscionable, superlative most unconscionable)

Not conscionable; unscrupulous and lacking principles or conscience.
- 2001, Joyce Carol Oates, Middle Age: A Romance (Fourth Estate, paperback edition, p364)
  When Roger assured him that prospects "looked very good" for a retrial, even a reversal of the verdict, since Roger had discovered "unconscionable errors" in the trial, Jackson grunted in bemusement and smiled with half his mouth.
Excessive, imprudent or unreasonable.
The effective rate of interest was unconscionable, but not legally usurious.