un ‧ con ‧ scion ‧ a ‧ ble /ʌnˈkɒnʃ ə nəb ə l $ -ˈkɑːn-/ BrE AmE 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