Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: conscionable 'acceptable' (16-21 centuries), from conscion, taken as a singular form of conscience

unconscionable

adjective
     
un‧con‧scion‧a‧ble formal
much more than is reasonable or acceptable:
The war caused an unconscionable amount of suffering.
unconscionably adverb

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