This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not restrained by conscience; unscrupulous: unconscionable behavior.

adj. Beyond prudence or reason; excessive: unconscionable spending.

adj. Not conscionable; unscrupulous and lacking principles or conscience.

adj. Excessive, imprudent or unreasonable.

adj. Not conscionable; exceeding the limits of any reasonable claim or expectation; not conforming to reason; unreasonable; inordinate; extravagant

adj. Not guided by, or conformed to, conscience; that cannot be done in good conscience.

Not conscionable; unreasonable; exceeding the limits of any reasonable claim or expectation; inordinate; enormous: as, an unconscionable demand.

Not guided or influenced by conscience.

adj. lacking a conscience

adj. greatly exceeding bounds of reason or moderation

"The UMW also rebuked federal regulators-- and, to a lesser extent, their state counterparts -- for what it called an "unconscionable" failure to use all the tools they had to shut down the long-troubled mine and prevent the nation's deadliest coal mine explosion in four decades."

unconscientious    immoderate   

unconscionable bargain   

unreasonable    inordinate    extravagant   

dastardly    black-hearted    unforgivable    unpardonable    meanspirited