"unconscionable" in the adjective sense
1. conscienceless, unconscionable
lacking a conscience
"a conscienceless villain"
"brash, unprincipled, and conscienceless"
"an unconscionable liar"
2. exorbitant, extortionate, outrageous, steep, unconscionable, usurious
greatly exceeding bounds of reason or moderation
"exorbitant rent"
"extortionate prices"
"spends an outrageous amount on entertainment"
"usurious interest rate"
"unconscionable spending"
Source: WordNet® (An amazing lexical database of English)
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