unconscionable
[adjective]
Synonyms: unscrupulous, conscienceless, stick-at-nothing, unprincipled, excessive, dizzy, exorbitant, extravagant, extreme, immoderate, inordinate, towering, undue, unmeasurable, unreasonable, unjustifiable, unwarrantable, unwarranted, outrageous, barbarous, unchristian, uncivilized, ungodly, unholy, wicked

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Antonyms: conscientious, conscionable

[TahlilGaran] English Synonym Dictionary ▲

un‧con‧scion‧a‧ble /ʌnˈkɒnʃənəbəl $ -ˈkɑːn-/ adjective formal
[Date: 1500-1600; Origin: conscionable 'acceptable' (16-21 centuries), from conscion, taken as a singular form of conscience]
much more than is reasonable or acceptable:
The war caused an unconscionable amount of suffering.
—unconscionably adverb

[TahlilGaran] Dictionary of Contemporary English ▲