Etymology
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unconscionable (adj.)

1560s, "showing no regard for conscience," from un- (1) + now rare conscionable "conscientious." Related: Unconscionably.

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Definitions of unconscionable

unconscionable (adj.)
lacking a conscience;
an unconscionable liar
Synonyms: conscienceless
unconscionable (adj.)
greatly exceeding bounds of reason or moderation;
unconscionable spending
From wordnet.princeton.edu