unconscionable in WordNet English dictionary

1. lacking a conscience
   "a conscienceless villain"; "brash, unprincipled, and conscienceless"; "an unconscionable liar"
   conscienceless  unconscionable 
   
2. greatly exceeding bounds of reason or moderation
   "exorbitant rent"; "extortionate prices"; "spends an outrageous amount on entertainment"; "usurious interest rate"; "unconscionable spending"
   exorbitant  extortionate  outrageous  steep  unconscionable  usurious